Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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]
  • Character class intersection
    [\w&&[^\d]]
  • 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
Processing...

Test String

Substitution
Processing...

Code Generator

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"^data:(?:(?<mime>[^;,]+);?)?(?:;charset=(?<charset>[^;,]+);?)?(?:;(?<base64>base64);?)?,(?<content>.*)$"; string substitution = @"📦mime: 『$1』 📦charset: 『$2』 📦content: 『$4』 《$3》\n---------------------------------------------------------------------------------"; string input = @"data:text/html base64,PGgxPua1i+ivlTwvaDE+ data:text/html;,PGgxPua1i+ivlTwvaDE+ data:text/html;base64,PGgxPua1i+ivlTwvaDE+ data:text/html;charset=big5;base64,PGgxPua1i+ivlTwvaDE+ data:text/html;charset=utf-16le;base64,PGgxPua1i+ivlTwvaDE+ data:text/html;charset=utf-16be;base64,PGgxPua1i+ivlTwvaDE+ data:text/html;charset=gbk;base64,PGgxPua1i+ivlTwvaDE+ data:text/html;charset=latin1;base64,PGgxPua1i+ivlTwvaDE+ data:text/html;charset=utf8;base64,PGgxPua1i+ivlTwvaDE+ data:text/plain;charset=utf8;base64,PGgxPua1i+ivlTwvaDE+ data:text/html;charset=gbk;base64,PGgxPrLiytQ8L2gxPg== data:text/html;base64,测试 data:text/html,%E6%B5%8B%E8%AF%95 "; RegexOptions options = RegexOptions.Multiline; Regex regex = new Regex(pattern, options); string result = regex.Replace(input, substitution); } }

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