Regular Expressions 101

Save & Share

  • Regex Version: ver. 2
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

/
/
gmi

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"{\s*file\s*:\s*[""']\s*(http[^""']+\.mp4)"; string input = @"<!DOCTYPE html> <html> <head> <meta charset=""UTF-8"" /> <meta name=""viewport"" content=""width=device-width, initial-scale=1, maximum-scale=1"" /> <link href='https://fonts.googleapis.com/css?family=Hanuman' rel='stylesheet' type='text/css'> <link href=""https://fonts.googleapis.com/css?family=Scada"" rel=""stylesheet""> <link href=""jwplayer-7.12.8/skins/prime.min2.css"" rel=""stylesheet"" type=""text/css"" /> <script type=""text/javascript"" src=""jwplayer-7.12.8/jwplayer.js""></script> <script type=""text/javascript"">jwplayer.key=""I9HOJrL1NmqruQ60as34wt34/23422dsdrwer=="";</script> </head> <body> <div id=""picasa"" class=""picasa""></div> <script type=""text/javascript""> var playerInstance = jwplayer(""picasa""); playerInstance.setup({ id:'picasa', controls: true, displaytitle: true, flashplayer: ""//ssl.p.jwpcdn.com/player/v/7.12.5/jwplayer.flash.swf"", width: ""100%"", height: ""100%"", aspectratio: ""16:9"", fullscreen: ""true"", provider: 'http', autostart: false, image:'http://localhost/viral/viralvideo.jpg', sources: [{file:""http://localhost/srt/43534234/viral022018SD.MP4"",label:""SD"",type: ""video/mp4""},{file:""http://localhost/srt/43534234/viral022018HD.MP4"",label:""HD"",type: ""video/mp4"",default: true}], sharing:{ link: "", code: "", heading: ""Share"", sites: [""facebook"",""twitter"",""tumblr"",""googleplus"",""reddit"",""linkedin"",""interest"",""email""], }, sharing:{ link: "", code: "", heading: ""Share"", sites: [""facebook"",""twitter"",""tumblr"",""googleplus"",""reddit"",""linkedin"",""interest"",""email""], }, tracks: [{ file: 'http://localhost/srt/viralvideo022018.srt', label: 'English', kind: 'captions', ""default"":true }], captions: { color: '#FFEB3B', fontSize: 14, fontFamily: 'Scada, Hanuman, sans-serif, Verdana, cursive', fontOpacity: 100, backgroundOpacity: 0, backgroundColor: '#000000', edgeStyle: 'raised', windowColor: '#000000', windowOpacity: 0 }, skin: { name: 'prime', }, }); </script> </body> </html>"; RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnoreCase; foreach (Match m in Regex.Matches(input, pattern, options)) { Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index); } } }

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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx