frontend and backend

2022-01-09 12:08:42 +01:00
parent cbff7c5d22
commit dde65761e5
75 changed files with 37830 additions and 19 deletions
--- a/frontend/.env
+++ b/frontend/.env
@ -0,0 +1 @@
+#REACT_APP_DEV=1
--- a/frontend/.gitignore
+++ b/frontend/.gitignore
@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
--- a/frontend/README.md
+++ b/frontend/README.md
@ -0,0 +1,70 @@
+# Getting Started with Create React App
+
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.\
+Open [http://localhost:3000](http://localhost:3000) to view it in your browser.
+
+The page will reload when you make changes.\
+You may also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.\
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.\
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.\
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can't go back!**
+
+If you aren't satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
+
+Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you're on your own.
+
+You don't have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn't feel obligated to use this feature. However we understand that this tool wouldn't be useful if you couldn't customize it when you are ready for it.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
+
+### Code Splitting
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](https://facebook.github.io/create-react-app/docs/code-splitting)
+
+### Analyzing the Bundle Size
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size)
+
+### Making a Progressive Web App
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app)
+
+### Advanced Configuration
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](https://facebook.github.io/create-react-app/docs/advanced-configuration)
+
+### Deployment
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
+
+### `npm run build` fails to minify
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
--- a/frontend/package.json
+++ b/frontend/package.json
@ -0,0 +1,45 @@
+{
+  "name": "frontend",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^5.16.1",
+    "@testing-library/react": "^12.1.2",
+    "@testing-library/user-event": "^13.5.0",
+    "axiom": "^0.1.6",
+    "axios": "^0.24.0",
+    "bootstrap": "^5.1.3",
+    "react": "^17.0.2",
+    "react-bootstrap": "^2.0.4",
+    "react-copy-to-clipboard": "^5.0.4",
+    "react-dom": "^17.0.2",
+    "react-icons": "^4.3.1",
+    "react-scripts": "5.0.0",
+    "sass": "^1.45.1",
+    "web-vitals": "^2.1.2"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}
--- a/frontend/public/favicon.ico
+++ b/frontend/public/favicon.ico
--- a/frontend/public/img/android-chrome-192x192.png
+++ b/frontend/public/img/android-chrome-192x192.png
--- a/frontend/public/img/android-chrome-512x512.png
+++ b/frontend/public/img/android-chrome-512x512.png
--- a/frontend/public/img/apple-touch-icon.png
+++ b/frontend/public/img/apple-touch-icon.png
--- a/frontend/public/img/browserconfig.xml
+++ b/frontend/public/img/browserconfig.xml
@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig>
+    <msapplication>
+        <tile>
+            <square150x150logo src="/img/icons/mstile-150x150.png"/>
+            <TileColor>#5755d9</TileColor>
+        </tile>
+    </msapplication>
+</browserconfig>
--- a/frontend/public/img/favicon-16x16.png
+++ b/frontend/public/img/favicon-16x16.png
--- a/frontend/public/img/favicon-32x32.png
+++ b/frontend/public/img/favicon-32x32.png
--- a/frontend/public/img/favicon.ico
+++ b/frontend/public/img/favicon.ico
--- a/frontend/public/img/mstile-150x150.png
+++ b/frontend/public/img/mstile-150x150.png
--- a/frontend/public/img/safari-pinned-tab.svg
+++ b/frontend/public/img/safari-pinned-tab.svg
@ -0,0 +1,142 @@
+<?xml version="1.0" standalone="no"?>
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+ "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
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+ width="1024.000000pt" height="1024.000000pt" viewBox="0 0 1024.000000 1024.000000"
+ preserveAspectRatio="xMidYMid meet">
+<metadata>
+Created by potrace 1.11, written by Peter Selinger 2001-2013
+</metadata>
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--- a/frontend/public/img/site.webmanifest
+++ b/frontend/public/img/site.webmanifest
@ -0,0 +1,19 @@
+{
+    "name": "",
+    "short_name": "",
+    "icons": [
+        {
+            "src": "/img/icons/android-chrome-192x192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "/img/icons/android-chrome-512x512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        }
+    ],
+    "theme_color": "#ffffff",
+    "background_color": "#ffffff",
+    "display": "standalone"
+}
--- a/frontend/public/index.html
+++ b/frontend/public/index.html
@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="PHP Regular Expression online tester and encoder/decoder tools."
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/img/android-chrome-192x192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>PHP tools - RegExp and D/Encoder</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>
--- a/frontend/public/manifest.json
+++ b/frontend/public/manifest.json
@ -0,0 +1,25 @@
+{
+  "short_name": "PHP RegExp and D/Encoder",
+  "name": "PHP Regular Expression online tester and encoder/decoder tools.",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "/img/android-chrome-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/img/android-chrome-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ],
+  "start_url": "./index.html",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}
--- a/frontend/public/robots.txt
+++ b/frontend/public/robots.txt
@ -0,0 +1,3 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:
--- a/frontend/src/App.js
+++ b/frontend/src/App.js
@ -0,0 +1,178 @@
+
+import React, { Component } from 'react';
+import axios from 'axios';
+
+import Container from 'react-bootstrap/Container';
+import Row from 'react-bootstrap/Row';
+import Col from 'react-bootstrap/Col';
+
+import Header from "./Header";
+import Tabs from "./preg/Tabs";
+import Opts from "./preg/Opts";
+import Fields from "./preg/Fields";
+import Return from "./preg/Return";
+import Code from "./preg/Code";
+import Output from "./preg/Output";
+import Footer from "./Footer";
+import Help from "./preg/Help";
+
+export default class App extends Component {
+    constructor(props) {
+        super(props)
+
+        this.state = {
+            method: 'preg_match',
+            pattern: '',
+            replacement: '',
+            subject: '',
+            offset: null,
+            limit: null,
+            delimiter: null,
+            PREG_OFFSET_CAPTURE: false,
+            PREG_UNMATCHED_AS_NULL: false,
+            PREG_SET_ORDER: false,
+            PREG_SPLIT_NO_EMPTY: false,
+            PREG_SPLIT_DELIM_CAPTURE: false,
+            PREG_SPLIT_OFFSET_CAPTURE: false,
+            response: {},
+            help: false
+        }
+
+        this.timer = null
+        this.apiUrl = window.location.href +'api/preg'
+        //this.apiUrl = 'http://localhost:8086/api/preg'
+        this.maps = {
+            'preg_match': {
+                'fields': ['pattern', 'subject'],
+                'opts': ['PREG_OFFSET_CAPTURE', 'PREG_UNMATCHED_AS_NULL', 'offset']
+            },
+            'preg_match_all': {
+                'fields': ['pattern', 'subject'],
+                'opts': ['PREG_PATTERN_ORDER', 'PREG_SET_ORDER', 'PREG_OFFSET_CAPTURE', 'PREG_UNMATCHED_AS_NULL', 'offset']
+            },
+            'preg_split': {
+                'fields': ['pattern', 'subject'],
+                'opts': ['PREG_SPLIT_NO_EMPTY', 'PREG_SPLIT_DELIM_CAPTURE', 'PREG_SPLIT_OFFSET_CAPTURE', 'limit']
+            },
+            'preg_replace': {
+                'fields': ['pattern', 'subject', 'replacement'],
+                'opts': ['limit']
+            },
+            'preg_quote': {
+                'fields': ['pattern'],
+                'opts': ['delimeter']
+            }
+        }
+    }
+
+    componentDidMount() {
+        window.addEventListener("hashchange", this.hashChange, false)
+        this.hashChange()
+    }
+
+    hashChange = () => {
+        const hash = window.location.hash.replace(/^#/, '')
+
+        if (hash && hash !== 'close' && hash !== 'help' && hash !== this.state.response.hash) {
+            axios.get(this.apiUrl, { params: { hash } }).then((res) => {
+                this.setState({ ...res.data, response: {} }, () => {
+                    this.api()
+                })
+            })
+        }
+    }
+
+    methodSelect = (method) => {
+        this.setState({method}, this.api)
+    }
+
+    handleInputChange = (event) => {
+        const target = event.target
+        const value = (target.type === 'checkbox')? 
+            target.checked: 
+            (target.type === 'number'? 
+                parseInt(target.value): 
+                target.value)
+        const name = target.name
+
+        this.setState({ [name]: value }, this.delay)
+    }
+
+    api = () => {
+        const { response, help, ...state } = this.state
+
+        axios.post(this.apiUrl, state).then((res) => {
+            this.setState({ response: res.data }, () => {
+                if ('hash' in res.data) {
+                    window.location.hash = '#'+res.data.hash;
+                }
+            })
+        }).catch((error) => {
+            //console.log(error.response)
+            this.setState({ response: {
+                fatal: (error.response? error.response.data.fatal: error.message)
+            } }, () => {
+                window.history.replaceState(null, null, ' ');
+            })
+        });
+    }
+
+    delay = () => {
+        clearTimeout(this.timer)
+        this.timer = setTimeout(this.api, 200)
+    }
+
+    showHelp = (show) => {
+        this.setState({ help: show })
+    }
+
+    render() {
+        const { method, pattern, replacement, subject, response, help, ...state } = this.state
+        const maps = this.maps[method]
+
+        return (
+<>
+    <Header method={method} hash={response.hash? window.location.origin+"/#"+response.hash: null} onClick={() => this.showHelp(true)} />
+
+    <Container>
+        <Row className="mt-3 mb-3">
+            <Col>
+                <Tabs method={method} functions={Object.keys(this.maps)} onChange={this.methodSelect} />
+            </Col>
+        </Row>
+
+        <Fields method={method} fields={maps.fields} pattern={pattern} replacement={replacement} subject={subject} onChange={this.handleInputChange} />
+
+        <div className="separator">options</div>
+        <Opts method={method} opts={maps.opts} {...state} onChange={this.handleInputChange} />
+
+        <Row className="mt-3">
+            <Col xs="3" sm="2">
+                <div className="separator">return</div>
+                <Return response={response} />
+            </Col>
+            <Col>
+                <div className="separator">snippet</div>
+                <Code response={response} />
+            </Col>
+        </Row>
+
+        <Row className="mt-3">
+            <Col>
+                <div className="separator">$matches or result</div>
+                <Output response={response} />
+            </Col>
+        </Row>
+
+        <Row className="mt-3 text-end">
+            <Col>
+                <Footer />
+            </Col>
+        </Row>
+    </Container>
+
+    <Help show={help} onHide={() => this.showHelp(false)} />
+</>
+        );
+    }
+}
--- a/frontend/src/Footer.js
+++ b/frontend/src/Footer.js
@ -0,0 +1,16 @@
+import React, { Component } from 'react';
+
+import { BsFileEarmarkCodeFill, BsTwitter } from "react-icons/bs";
+
+export default class Footer extends Component {
+  render() {
+    return (
+<footer>
+    <small>
+        Coded by <a href="https://twitter.com/xergio">Sergio Álvarez <BsTwitter /></a>{' '}
+        <span className="text-muted">¦</span>{' '}
+        <a href="https://sergio.am/code/xrg.es"><BsFileEarmarkCodeFill /></a></small>
+</footer>
+    )
+  }
+}
--- a/frontend/src/Header.js
+++ b/frontend/src/Header.js
@ -0,0 +1,53 @@
+import React, { Component } from 'react';
+
+import { CopyToClipboard } from 'react-copy-to-clipboard';
+
+import { BsFillQuestionCircleFill, BsFillInfoCircleFill } from "react-icons/bs";
+import { FiPaperclip } from "react-icons/fi";
+
+import Container from 'react-bootstrap/Container';
+import Navbar from 'react-bootstrap/Navbar';
+import Nav from 'react-bootstrap/Nav';
+
+export default class Header extends Component {
+    state = {
+        copied: false,
+    };
+
+    render() {
+        return (
+<Navbar bg="light" expand="sm">
+    <Container>
+        <Navbar.Brand href="/">
+            <img
+                alt=""
+                src="/img/safari-pinned-tab.svg"
+                width="30"
+                height="30"
+                className="d-inline-block align-top"
+            />{' '}
+            <strong>XRG</strong>
+        </Navbar.Brand>
+        <Navbar.Toggle aria-controls="basic-navbar-nav" />
+        <Navbar.Collapse id="basic-navbar-nav">
+            <Nav className="me-auto">
+                <Nav.Link href="/">RegExp</Nav.Link>
+                <Nav.Link href="/dencode">D/Encode</Nav.Link>
+            </Nav>
+            <Nav>
+            {this.props.hash && 
+                <Nav.Link href={this.props.hash} title="Permalink" className="text-success">
+                    <CopyToClipboard text={this.props.hash} onCopy={() => this.setState({copied: true})}>
+                        <FiPaperclip />
+                    </CopyToClipboard>
+                </Nav.Link>
+            }
+                <Nav.Link href={'https://php.net/'+this.props.method} title="PHP.net documentation"><BsFillInfoCircleFill /></Nav.Link>
+                <Nav.Link href="#help" title="Help" onClick={this.props.onClick}><BsFillQuestionCircleFill /></Nav.Link>
+            </Nav>
+        </Navbar.Collapse>
+    </Container>
+</Navbar>
+        )
+    }
+}
--- a/frontend/src/_bootswatch.scss
+++ b/frontend/src/_bootswatch.scss
@ -0,0 +1,35 @@
+// Cosmo 5.1.3
+// Bootswatch
+
+
+// Variables
+
+$web-font-path: "https://fonts.googleapis.com/css2?family=Source+Sans+Pro:wght@300;400;700&display=swap" !default;
+@if $web-font-path {
+  @import url($web-font-path);
+}
+
+// Typography
+
+body {
+  -webkit-font-smoothing: antialiased;
+}
+
+// Indicators
+
+.badge {
+  &.bg-light {
+    color: $dark;
+  }
+}
+
+// Progress bars
+
+.progress {
+  @include box-shadow(none);
+
+  .progress-bar {
+    font-size: 8px;
+    line-height: 8px;
+  }
+}
--- a/frontend/src/_variables.scss
+++ b/frontend/src/_variables.scss
@ -0,0 +1,69 @@
+// Cosmo 5.1.3
+// Bootswatch
+
+$theme: "cosmo" !default;
+
+//
+// Color system
+//
+
+$white:    #fff !default;
+$gray-100: #f8f9fa !default;
+$gray-200: #e9ecef !default;
+$gray-300: #dee2e6 !default;
+$gray-400: #ced4da !default;
+$gray-500: #adb5bd !default;
+$gray-600: #868e96 !default;
+$gray-700: #495057 !default;
+$gray-800: #373a3c !default;
+$gray-900: #212529 !default;
+$black:    #000 !default;
+
+$blue:    #2780e3 !default;
+$indigo:  #6610f2 !default;
+$purple:  #613d7c !default;
+$pink:    #e83e8c !default;
+$red:     #ff0039 !default;
+$orange:  #f0ad4e !default;
+$yellow:  #ff7518 !default;
+$green:   #3fb618 !default;
+$teal:    #20c997 !default;
+$cyan:    #9954bb !default;
+
+$primary:       $blue !default;
+$secondary:     $gray-800 !default;
+$success:       $green !default;
+$info:          $cyan !default;
+$warning:       $yellow !default;
+$danger:        $red !default;
+$light:         $gray-100 !default;
+$dark:          $gray-800 !default;
+
+$min-contrast-ratio:   2.6 !default;
+
+// Options
+
+$enable-rounded: false !default;
+
+// Body
+
+$body-color:    $gray-800 !default;
+
+// Fonts
+
+// stylelint-disable-next-line value-keyword-case
+$font-family-sans-serif:    "Source Sans Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol" !default;
+$headings-font-weight:      400 !default;
+
+// Navbar
+
+$navbar-dark-hover-color:       rgba($white, 1) !default;
+$navbar-light-hover-color:      rgba($black, .9) !default;
+
+// Alerts
+
+$alert-border-width:            0 !default;
+
+// Progress bars
+
+$progress-height:               .5rem !default;
--- a/frontend/src/index.js
+++ b/frontend/src/index.js
@ -0,0 +1,11 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.scss';
+import App from './App';
+
+ReactDOM.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+  document.getElementById('root')
+);
--- a/frontend/src/index.scss
+++ b/frontend/src/index.scss
@ -0,0 +1,43 @@
+
+.separator {
+    display: flex;
+    color: #ddd;
+    font-size: .9rem;
+    margin-top: 1.5rem;
+}
+
+/*.separator::after {
+    content: '';
+    flex: 1;
+    height: 0.08rem;
+    background: linear-gradient(90deg, rgba(231,233,237,1) 0%, rgba(255,255,255,1) 80%);
+    transform: translateY(.75rem);
+}
+
+.separator:not(:empty)::after {
+  margin-left: .25em;
+}*/
+
+//$body-bg: #567890;
+
+.table {
+    width: unset !important;
+}
+
+table td:first-child:before {
+  content: '[';
+  color: var(--bs-table-bg);
+}
+
+table td:first-child:after {
+  content: ']';
+  color: var(--bs-table-bg);
+}
+
+.nav-item:hover {
+  background-color: #eaeaea !important;
+}
+
+@import "_variables";
+@import "~bootstrap/scss/bootstrap";
+@import "_bootswatch";
--- a/frontend/src/preg/Code.js
+++ b/frontend/src/preg/Code.js
@ -0,0 +1,19 @@
+import React, { Component } from 'react';
+
+function createMarkup(html) {
+    return {__html: html}
+}
+
+export default class Code extends Component {
+  render() {
+    const { response } = this.props;
+
+    return (
+<>
+{'code' in response &&
+    <code dangerouslySetInnerHTML={createMarkup(response.code)} />
+}
+</>
+    )
+  }
+}
--- a/frontend/src/preg/Fields.js
+++ b/frontend/src/preg/Fields.js
@ -0,0 +1,29 @@
+import React, { Component } from 'react';
+import Form from 'react-bootstrap/Form';
+
+export default class Fields extends Component {
+    render() {
+        return (
+<>
+{this.props.fields.includes('pattern') &&
+    <Form.Group className="mb-3" controlId="pattern">
+        <Form.Label>Regular Expression / Pattern</Form.Label>
+        <Form.Control type="text" onChange={this.props.onChange} name="pattern" value={this.props.pattern}  placeholder="#...#" className="font-monospace" />
+    </Form.Group>
+}
+{this.props.fields.includes('replacement') &&
+    <Form.Group className="mb-3" controlId="replacement">
+        <Form.Label>Replacement</Form.Label>
+        <Form.Control type="text" onChange={this.props.onChange} name="replacement" value={this.props.replacement}  />
+    </Form.Group>
+}
+{this.props.fields.includes('subject') &&
+    <Form.Group className="mb-3" controlId="subject">
+        <Form.Label>String / Subject</Form.Label>
+        <Form.Control as="textarea" onChange={this.props.onChange} name="subject" value={this.props.subject} rows={3} />
+    </Form.Group>
+}
+</>
+        );
+    }
+}
--- a/frontend/src/preg/Help.js
+++ b/frontend/src/preg/Help.js
@ -0,0 +1,102 @@
+import React, { Component } from 'react';
+
+import Container from 'react-bootstrap/Container';
+import Row from 'react-bootstrap/Row';
+import Col from 'react-bootstrap/Col';
+import Modal from 'react-bootstrap/Modal';
+
+export default class Help extends Component {
+    render() {
+        return (
+<Modal {...this.props} size="xl">
+    <Modal.Header closeButton>
+        <Modal.Title>Regexp spreadsheet (<a href="http://php.net/manual/en/pcre.pattern.php">full documentation</a>)</Modal.Title>
+    </Modal.Header>
+    <Modal.Body>
+        <Container>
+            <Row>
+                <Col>
+                    <h4>Pattern Modifiers</h4>
+                    <div><code>i</code> PCRE_CASELESS</div>
+                    <div><code>m</code> PCRE_MULTILINE</div>
+                    <div><code>s</code> PCRE_DOTALL</div>
+                    <div><code>x</code> PCRE_EXTENDED</div>
+                    <div><code>A</code> PCRE_ANCHORED</div>
+                    <div><code>D</code> PCRE_DOLLAR_ENDONLY</div>
+                    <div><code>S</code> Extra analysis</div>
+                    <div><code>U</code> PCRE_UNGREEDY</div>
+                    <div><code>X</code> PCRE_EXTRA</div>
+                    <div><code>J</code> PCRE_INFO_JCHANGED</div>
+                    <div><code>u</code> PCRE_UTF8</div>
+                </Col>
+
+                <Col>
+                    <h4>Meta-characters outside <code>[ ]</code></h4>
+                    <div><code>\</code> general escape character</div>
+                    <div><code>^</code> assert start of subject (or line, in multiline mode)</div>
+                    <div><code>$</code> assert end of subject (or line, in multiline mode)</div>
+                    <div><code>.</code> match any character except newline (by default)</div>
+                    <div><code>[ ]</code> character class definition</div>
+                    <div><code>|</code> start of alternative branch</div>
+                    <div><code>( )</code> subpattern</div>
+                    <div><code>?</code> extends the meaning of '(', also 0 or 1 quantifier</div>
+                    <div><code>*</code> 0 or more quantifier</div>
+                    <div><code>+</code> 1 or more quantifier</div>
+                    <div><code>{'{ }'}</code> min/max quantifier, {'{n[,n]}'}</div>
+
+                    <h4 className="mt-4">Meta-characters inside <code>[ ]</code></h4>
+                    <div><code>\</code> general escape character</div>
+                    <div><code>^</code> negate the class, but only if the first character</div>
+                    <div><code>-</code> indicates character range</div>
+
+                    <h4 className="mt-4">Others</h4>
+                    <div><code>{'\\1-9'}</code> in-group back references</div>
+                    <div><code>(?P&lt;lbl&gt;...)</code> labelize subpatterns</div>
+                    <div><code>(?:...)</code> non-capture group</div>
+                    <div><code>(?&gt;...)</code> Atomic group</div>
+                    <div><code>(?=...)</code> Positive lookahead</div>
+                    <div><code>(?!...)</code> Negative lookahead</div>
+                    <div><code>(?&lt;=..)</code> Positive lookbehind</div>
+                    <div><code>(?&lt;!..)</code> Negative lookbehind</div>
+                    <div><code>(?(?=.).|.)</code> if . then . else .</div>
+                    <div><code>(?#...)</code> Comment</div>
+                </Col>
+
+                <Col>
+                    <h4>Scape sequences</h4>
+                    <div><code>\a</code> alarm, that is, the BEL character (hex 07)</div>
+                    <div><code>\cx</code> "control-x", where x is any character</div>
+                    <div><code>\e</code> escape (hex 1B)</div>
+                    <div><code>\f</code> formfeed (hex 0C)</div>
+                    <div><code>\n</code> newline (hex 0A)</div>
+                    <div><code>\r</code> carriage return (hex 0D)</div>
+                    <div><code>\R</code> line break: matches \n, \r and \r\n</div>
+                    <div><code>\t</code> tab (hex 09)</div>
+                    <div><code>\p{'{xx}'}</code> a character with the xx <a href="http://www.php.net/manual/en/regexp.reference.unicode.php">property</a></div>
+                    <div><code>\P{'{xx}'}</code> a character without the xx <a href="http://www.php.net/manual/en/regexp.reference.unicode.php">property</a></div>
+                    <div><code>\xhh</code> character with hex code hh</div>
+                    <div><code>\ddd</code> character with octal code ddd, or backreference</div>
+                    <div><code>\d</code> any decimal digit</div>
+                    <div><code>\D</code> any character that is not a decimal digit</div>
+                    <div><code>\s</code> any whitespace character</div>
+                    <div><code>\S</code> any character that is not a whitespace character</div>
+                    <div><code>\h</code> any horizontal whitespace character</div>
+                    <div><code>\H</code> any character that is not a horizontal whitespace</div>
+                    <div><code>\v</code> any vertical whitespace character</div>
+                    <div><code>\V</code> any character that is not a vertical whitespace character</div>
+                    <div><code>\w</code> any "word" character</div>
+                    <div><code>\W</code> any "non-word" character</div>
+                    <div><code>\b</code> word boundary</div>
+                    <div><code>\B</code> not a word boundary</div>
+                    <div><code>\A</code> start of subject (independent of multiline mode)</div>
+                    <div><code>\Z</code> end of subject or newline at end (independent of multiline mode)</div>
+                    <div><code>\z</code> end of subject (independent of multiline mode)</div>
+                    <div><code>\G</code> first matching position in subject</div>
+                </Col>
+            </Row>
+        </Container>
+    </Modal.Body>
+</Modal>
+        )
+    }
+}
--- a/frontend/src/preg/Opts.js
+++ b/frontend/src/preg/Opts.js
@ -0,0 +1,55 @@
+import React, { Component } from 'react';
+import Form from 'react-bootstrap/Form';
+import InputGroup from 'react-bootstrap/InputGroup';
+import Col from 'react-bootstrap/Col';
+
+function Checkbox(props) {
+    return props.opts.includes(props.id)? (
+    <Form.Group className="mb-3" controlId={props.id}>
+        <Form.Check type="checkbox" name={props.id} label={props.id} checked={props[props.id]} onChange={props.onChange} />
+    </Form.Group>
+    ): '';
+}
+
+export default class Opts extends Component {
+    render() {
+        return (
+<>
+{this.props.opts.includes('PREG_SET_ORDER') &&
+    <p className="text-muted"><tt>PREG_PATTERN_ORDER</tt> is the default order method.</p>
+}
+    <Checkbox id="PREG_SET_ORDER" {...this.props} />
+    <Checkbox id="PREG_OFFSET_CAPTURE" {...this.props} />
+    <Checkbox id="PREG_UNMATCHED_AS_NULL" {...this.props} />
+    <Checkbox id="PREG_SPLIT_NO_EMPTY" {...this.props} />
+    <Checkbox id="PREG_SPLIT_DELIM_CAPTURE" {...this.props} />
+    <Checkbox id="PREG_SPLIT_OFFSET_CAPTURE" {...this.props} />
+
+{this.props.opts.includes('offset') &&
+    <Col xl="2" md="3" sm="4" xs="6">
+        <InputGroup className="mb-3">
+            <InputGroup.Text id="offset">offset</InputGroup.Text>
+            <Form.Control type="number" name="offset" placeholder="0" aria-label="offset" aria-describedby="offset" value={this.props.offset ?? ''} onChange={this.props.onChange} min="0" />
+        </InputGroup>
+    </Col>
+}
+{this.props.opts.includes('limit') &&
+    <Col xl="2" md="3" sm="4" xs="6">
+        <InputGroup className="mb-3">
+            <InputGroup.Text id="limit">limit</InputGroup.Text>
+            <Form.Control type="number" name="limit" placeholder="-1" aria-label="limit" aria-describedby="limit" value={this.props.limit ?? ''} onChange={this.props.onChange} min="-1" />
+        </InputGroup>
+    </Col>
+}
+{this.props.opts.includes('delimeter') &&
+    <Col xl="2" md="3" sm="4" xs="6">
+        <InputGroup className="mb-3">
+        <InputGroup.Text id="delimiter">delimiter</InputGroup.Text>
+        <Form.Control name="delimiter" aria-label="delimiter" aria-describedby="delimiter" value={this.props.delimiter ?? ''} onChange={this.props.onChange} />
+        </InputGroup>
+    </Col>
+}
+</>
+        );
+    }
+}
--- a/frontend/src/preg/Output.js
+++ b/frontend/src/preg/Output.js
@ -0,0 +1,70 @@
+import React, { Component } from 'react';
+
+import Table from 'react-bootstrap/Table'
+
+function mapObject(object, callback) {
+  return Object.keys(object).map(key => {
+    return callback(key, object[key])
+  })
+}
+
+const DumpList = (props) => {
+  const type = typeof props.dump
+
+  if (type === "object") {
+    if (Object.keys(props.dump).length === 0) {
+      return <tt className="text-secondary">[]</tt>
+    }
+
+    const items = mapObject(props.dump, (key, value) => {
+      if (['number', 'string'].includes(typeof value)) {
+        // .replace(" ", '⎵')
+        return (
+            <tr key={key}>
+                <td className="table-active text-end text-muted font-monospace">{key}</td>
+                <td className="px-2">{value}</td>
+            </tr>
+        )
+      } else {
+        return (
+            <tr key={key}>
+                <td className="table-active text-end text-muted font-monospace">{key}</td>
+                <td><DumpList dump={value} indent={props.indent + 1} /></td>
+            </tr>
+        )
+      }
+    })
+
+    return (
+      <Table borderless variant="light" size="sm">
+        <tbody>
+          {items}
+        </tbody>
+      </Table>
+    )
+
+  } else if (type === 'string') {
+    return (<tt>{props.dump}</tt>)
+  }
+
+  return (<em>empty result</em>)
+}
+
+export default class Output extends Component {
+  render() {
+    const { response } = this.props;
+
+    return (
+<>
+{'fatal' in response &&
+    <div>
+        <code>{response.fatal}</code>
+    </div>
+}
+{'dump' in response &&
+    <DumpList dump={response.dump} indent={0} />
+}
+</>
+    )
+  }
+}
--- a/frontend/src/preg/Return.js
+++ b/frontend/src/preg/Return.js
@ -0,0 +1,18 @@
+import React, { Component } from 'react';
+
+export default class Return extends Component {
+    render() {
+        const { response } = this.props;
+
+        return (
+<>
+{'returnType' in response && 'returnValue' in response &&
+    <span>
+        <code>{response.returnType}</code>:{' '}<code>{response.returnValue}</code>
+    </span>
+}
+</>
+        )
+    }
+}
+
--- a/frontend/src/preg/Tabs.js
+++ b/frontend/src/preg/Tabs.js
@ -0,0 +1,20 @@
+import React, { Component } from 'react';
+import Nav from 'react-bootstrap/Nav';
+
+export default class Tabs extends Component {
+    render() {
+        const tabs = this.props.functions.map((func) =>  {
+            return (
+                <Nav.Item key={func} className="bg-light font-monospace"><Nav.Link eventKey={func}>{func}</Nav.Link></Nav.Item>
+            )
+        })
+
+        return (
+            <Nav fill variant="pills" defaultActiveKey={this.props.functions[0]} activeKey={this.props.method} onSelect={this.props.onChange}>
+                {tabs}
+            </Nav>
+        );
+    }
+}
+
+