Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
g

Test String

Code Generator

Language

Generated Code

$re = '/\{(?:[^{}]|(?R))*\}/'; $str = ' <!DOCTYPE html> <!--[if lt IE 7]> <html lang="sv" class="no-js lt-ie9 lt-ie8 lt-ie7 logged-in "> <![endif]--> <!--[if IE 7]> <html lang="sv" class="no-js lt-ie9 lt-ie8 logged-in "> <![endif]--> <!--[if IE 8]> <html lang="sv" class="no-js lt-ie9 logged-in "> <![endif]--> <!--[if gt IE 8]><!--> <html lang="sv" class="no-js logged-in "> <!--<![endif]--> <head><meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title> Kim Kardashian West (@kimkardashian) • Foton och videoklipp på Instagram </title> <script type="text/javascript"> WebFontConfig = { custom: { families: [\'proxima-nova:n3,n4,n6,n7\'], } }; </script> <script async type="text/javascript" src="/static/scripts/webfont.js/c0456c81549b.js"></script> <style type="text/css"> /* @license * MyFonts Webfont Build ID 2164953, 2012-03-23T23:06:30-0400 * * The fonts listed in this notice are subject to the End User License * Agreement(s) entered into by the website owner. All other parties are * explicitly restricted from using the Licensed Webfonts(s). * * You may obtain a valid license at the URLs below. * ** Webfont: Proxima Nova Light by Mark Simonson * URL: http://www.myfonts.com/fonts/marksimonson/proxima-nova/light/ * Licensed pageviews: unlimited * * Webfont: Proxima Nova Regular by Mark Simonson * URL: http://www.myfonts.com/fonts/marksimonson/proxima-nova/regular/ * Licensed pageviews: unlimited * * Webfont: Proxima Nova Semibold by Mark Simonson * URL: http://www.myfonts.com/fonts/marksimonson/proxima-nova/semibold/ * Licensed pageviews: unlimited ** Webfont: Proxima Nova Bold Italic by Mark Simonson * URL: http://www.myfonts.com/fonts/marksimonson/proxima-nova/bold-it/ * Licensed pageviews: unlimited * * Webfont: Proxima Nova Bold by Mark Simonson * URL: http://www.myfonts.com/fonts/marksimonson/proxima-nova/bold/ * Licensed pageviews: unlimited * * Webfont: Proxima Nova Italic by Mark Simonson * URL: http://www.myfonts.com/fonts/marksimonson/proxima-nova/regular-it/ * Licensed pageviews: unlimited * * * License: http://www.myfonts.com/viewlicense?type=web&buildid=2164953 * Webfonts copyright: Copyright (c) Mark Simonson, 2005. All rights reserved. * * (c) 2012 Bitstream Inc */@font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-bold-webfont.eot/115b1f7f9c04.eot\'); src: url(\' /static/webfonts/proximanova-bold-webfont.eot/115b1f7f9c04.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-bold-webfont.woff/618250d25a4d.woff\') format("woff"), url(\' /static/webfonts/proximanova-bold-webfont.ttf/646346e03084.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-bold-webfont.svg/e55a9d6051e8.svg#ProximaNovaBold\') format("svg"); font-weight: bold; font-style: normal; unicode-range: U+0000-00FF, U+0180-FFFF; } @font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-bold-latin-a-webfont.eot/78bfc2a26356.eot\'); src: url(\' /static/webfonts/proximanova-bold-latin-a-webfont.eot/78bfc2a26356.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-bold-latin-a-webfont.woff/2db359b9065d.woff\') format("woff"), url(\' /static/webfonts/proximanova-bold-latin-a-webfont.ttf/5ae1219dca10.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-bold-latin-a-webfont.svg/017659bcaa88.svg#proxima_nova_rgbold\') format("svg"); font-weight: bold; font-style: normal; unicode-range: U+0100-017F; } @font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-boldit-webfont.eot/1cbb869da891.eot\'); src: url(\' /static/webfonts/proximanova-boldit-webfont.eot/1cbb869da891.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-boldit-webfont.woff/b1cf049474c9.woff\') format("woff"), url(\' /static/webfonts/proximanova-boldit-webfont.ttf/3adb020ceae3.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-boldit-webfont.svg/29948a2d3c58.svg#ProximaNovaBoldItalic\') format("svg"); font-weight: bold; font-style: italic; unicode-range: U+0000-00FF, U+0180-FFFF; } @font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-boldit-latin-a-webfont.eot/72586d286717.eot\'); src: url(\' /static/webfonts/proximanova-boldit-latin-a-webfont.eot/72586d286717.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-boldit-latin-a-webfont.woff/ea0011f1fa31.woff\') format("woff"), url(\' /static/webfonts/proximanova-boldit-latin-a-webfont.ttf/54abdaf3ee52.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-boldit-latin-a-webfont.svg/c4f67e496911.svg#proxima_novabold_italic\') format("svg"); font-weight: bold; font-style: italic; unicode-range: U+0100-017F; }@font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-reg-webfont.eot/12af77715cee.eot\'); src: url(\' /static/webfonts/proximanova-reg-webfont.eot/12af77715cee.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-reg-webfont.woff/a9a9773b8e29.woff\') format("woff"), url(\' /static/webfonts/proximanova-reg-webfont.ttf/99e19808976a.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-reg-webfont.svg/c33d2fd56309.svg#ProximaNovaRegular\') format("svg"); font-weight: normal; font-style: normal; unicode-range: U+0000-00FF, U+0180-FFFF; } @font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-reg-latin-a-webfont.eot/58dcfca24dc5.eot\'); src: url(\' /static/webfonts/proximanova-reg-latin-a-webfont.eot/58dcfca24dc5.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-reg-latin-a-webfont.woff/b84975dc78a8.woff\') format("woff"), url(\' /static/webfonts/proximanova-reg-latin-a-webfont.ttf/794fcdf7d5cc.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-reg-latin-a-webfont.svg/08bad2145add.svg#proxima_nova_rgregular\') format("svg"); font-weight: normal; font-style: normal; unicode-range: U+0100-017F; } @font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-regit-webfont.eot/1bbbd1312b0d.eot\'); src: url(\' /static/webfonts/proximanova-regit-webfont.eot/1bbbd1312b0d.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-regit-webfont.woff/9e306befca91.woff\') format("woff"), url(\' /static/webfonts/proximanova-regit-webfont.ttf/4a8663684135.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-regit-webfont.svg/876278d4b189.svg#ProximaNovaRegularItalic\') format("svg"); font-weight: normal; font-style: italic; unicode-range: U+0000-00FF, U+0180-FFFF; } @font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-regit-latin-a-webfont.eot/1442d729c835.eot\'); src: url(\' /static/webfonts/proximanova-regit-latin-a-webfont.eot/1442d729c835.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-regit-latin-a-webfont.woff/7bce76dac8b7.woff\') format("woff"), url(\' /static/webfonts/proximanova-regit-latin-a-webfont.ttf/dfd8b0fc929b.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-regit-latin-a-webfont.svg/bb408d54ba63.svg#proxima_novaregular_italic\') format("svg"); font-weight: normal; font-style: italic; unicode-range: U+0100-017F; } @font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-sbold-webfont.eot/5016edf79e1d.eot\'); src: url(\' /static/webfonts/proximanova-sbold-webfont.eot/5016edf79e1d.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-sbold-webfont.woff/615c1b06d8fa.woff\') format("woff"), url(\' /static/webfonts/proximanova-sbold-webfont.ttf/2973bd483f7a.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-sbold-webfont.svg/868597833e49.svg#ProximaNovaSemibold\') format("svg"); font-weight: 600; font-style: normal; unicode-range: U+0000-00FF, U+0180-FFFF; } @font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-sbold-latin-a-webfont.eot/6385b14bf318.eot\'); src: url(\' /static/webfonts/proximanova-sbold-latin-a-webfont.eot/6385b14bf318.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-sbold-latin-a-webfont.woff/0a6bfac8fce0.woff\') format("woff"), url(\' /static/webfonts/proximanova-sbold-latin-a-webfont.ttf/6863621ed50b.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-sbold-latin-a-webfont.svg/608e88ac1050.svg#proxima_nova_ltsemibold\') format("svg"); font-weight: 600; font-style: normal; unicode-range: U+0100-017F; }@font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-light-webfont.eot/63c84728610f.eot\'); src: url(\' /static/webfonts/proximanova-light-webfont.eot/63c84728610f.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-light-webfont.woff/66bbe029f180.woff\') format("woff"), url(\' /static/webfonts/proximanova-light-webfont.ttf/eb408516399b.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-light-webfont.svg/858f6a9b7ef3.svg#ProximaNovaLight\') format("svg"); font-weight: 300; font-style: normal; unicode-range: U+0000-00FF, U+0180-FFFF; } @font-face { font-family: \'proxima-nova\'; src: url(\' /static/webfonts/proximanova-light-latin-a-webfont.eot/11d79924ec61.eot\'); src: url(\' /static/webfonts/proximanova-light-latin-a-webfont.eot/11d79924ec61.eot?#iefix\') format("embedded-opentype"), url(\' /static/webfonts/proximanova-light-latin-a-webfont.woff/bea5ea967c26.woff\') format("woff"), url(\' /static/webfonts/proximanova-light-latin-a-webfont.ttf/3a5fa8856fd7.ttf\') format("truetype"), url(\' /static/webfonts/proximanova-light-latin-a-webfont.svg/36736d1d0811.svg#proxima_nova_ltlight\') format("svg"); font-weight: 300; font-style: normal; unicode-range: U+0100-017F; }</style> <meta name="robots" content="noimageindex"> <meta name="mobile-web-app-capable" content="yes"> <meta name="theme-color" content="#000000"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <meta id="viewport" name="viewport" content="width=device-width, user-scalable=no, initial-scale=1, minimum-scale=1, maximum-scale=1"> <script type="text/javascript"> (function() { var docElement = document.documentElement; var classRE = new RegExp(\'(^|\\\\s)no-js(\\\\s|$)\'); var className = docElement.className; docElement.className = className.replace(classRE, \'$1js$2\'); })(); </script> <script type="text/javascript">window._timings = {"domLoading": Date.now()}</script> <link rel="apple-touch-icon-precomposed" sizes="76x76" href="/static/images/ico/apple-touch-icon-76x76-precomposed.png/932e4d9af891.png"> <link rel="apple-touch-icon-precomposed" sizes="120x120" href="/static/images/ico/apple-touch-icon-120x120-precomposed.png/004705c9353f.png"> <link rel="apple-touch-icon-precomposed" sizes="152x152" href="/static/images/ico/apple-touch-icon-152x152-precomposed.png/82467bc9bcce.png"> <link rel="apple-touch-icon-precomposed" sizes="167x167" href="/static/images/ico/apple-touch-icon-167x167-precomposed.png/515cb4eeeeee.png"> <link rel="apple-touch-icon-precomposed" sizes="180x180" href="/static/images/ico/apple-touch-icon-180x180-precomposed.png/94fd767f257b.png"> <link rel="icon" sizes="192x192" href="/static/images/ico/favicon-192.png/b407fa101800.png"> <link rel="mask-icon" href="/static/images/ico/favicon.svg/9d8680ab8a3c.svg" color="#262626"><link rel="shortcut icon" type="image/x-icon" href="/static/images/ico/favicon.ico/dfa85bb1fd63.ico"> <link rel="alternate" href="android-app://com.instagram.android/https/instagram.com/_u/kimkardashian/" /> <meta property="al:ios:app_name" content="Instagram" /> <meta property="al:ios:app_store_id" content="389801252" /> <meta property="al:ios:url" content="instagram://user?username=kimkardashian" /> <meta property="al:android:app_name" content="Instagram" /> <meta property="al:android:package" content="com.instagram.android" /> <meta property="al:android:url" content="https://www.instagram.com/_u/kimkardashian/" /> <link rel="canonical" href="https://www.instagram.com/kimkardashian/" /><meta name="description" content="97.4 mn följare, 98 följer, 3,718 inlägg - Se foton och videoklipp från Kim Kardashian West (@kimkardashian) på Instagram" /> <meta property="og:type" content="profile" /> <meta property="og:image" content="https://scontent-arn2-1.cdninstagram.com/t51.2885-19/s150x150/15877470_1793699214215757_155858904268406784_a.jpg" /> <meta property="og:title" content="Kim Kardashian West (@kimkardashian) • Foton och videoklipp på Instagram" /> <meta property="og:description" content="97.4 mn följare, 98 följer, 3,718 inlägg - Se foton och videoklipp från Kim Kardashian West (@kimkardashian) på Instagram" /> <meta property="og:url" content="https://www.instagram.com/kimkardashian/" /> <link hreflang="x-default" rel="alternate" href="https://www.instagram.com/kimkardashian/" /> <link hreflang="hr" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=hr" /> <link hreflang="hu" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=hu" /> <link hreflang="ur" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=ur" /> <link hreflang="ne" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=ne" /> <link hreflang="de" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=de" /> <link hreflang="sr" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=sr" /> <link hreflang="ml" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=ml" /> <link hreflang="nl" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=nl" /> <link hreflang="id" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=id" /> <link hreflang="es" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=es" /> <link hreflang="th" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=th" /> <link hreflang="cs" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=cs" /> <link hreflang="da" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=da" /> <link hreflang="tl" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=tl" /> <link hreflang="pl" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=pl" /> <link hreflang="uk" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=uk" /> <link hreflang="sv" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=sv" /> <link hreflang="gu" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=gu" /> <link hreflang="ro" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=ro" /> <link hreflang="ko" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=ko" /> <link hreflang="ja" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=ja" /> <link hreflang="el" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=el" /> <link hreflang="ru" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=ru" /> <link hreflang="vi" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=vi" /> <link hreflang="af" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=af" /> <link hreflang="bn" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=bn" /> <link hreflang="nb" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=nb" /> <link hreflang="bg" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=bg" /> <link hreflang="hi" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=hi" /> <link hreflang="zh-cn" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=zh-cn" /> <link hreflang="pt" rel="alternate" href="https://www.instagram.com/kimkardashian/?hl=pt" /> <link 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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php