Regular Expressions 101

Save & Manage Regex

  • Current Version: 2
  • 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]
  • 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

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"(?:having\s*?[^\s]+\s*?[^\w\s])"; string input = @"=== libinjection tests === 1 I like having true friends I like having true friends I having true friends I was having true friends 1 having Family and friends having meal outdoors === FP === 1 I like having true, friends 1 having test, test Family and friends having meal, outdoors having test , test having test test, === SQL === 8' GROUP BY ID_ARTICLE HAVING COUNT(ID_ARTICLE) = '2' 8' GROUP BY ID_ARTICLE HAVING 1 = 1 8' GROUP BY ID_ARTICLE HAVING 1, 8' GROUP BY ID_ARTICLE HAVING true, FROM Sales.SalesOrderDetail GROUP BY SalesOrderID HAVING SalesOrderID > 50000 -3223%'))) OR 1 GROUP BY CONCAT(0x716a787a71,(SELECT (CASE WHEN (3900=3900) THEN 1 ELSE 0 END)),0x7171627671,FLOOR(RAND(0)*2)) HAVING MIN(0)#"" -2906%' OR 1 GROUP BY CONCAT(0x716a787a71,(SELECT (CASE WHEN (3900=3900) THEN 1 ELSE 0 END)),0x7171627671,FLOOR(RAND(0)*2)) HAVING MIN(0)#"" -2836%00' OR 1 GROUP BY CONCAT(0x716a787a71,(SELECT (CASE WHEN (3900=3900) THEN 1 ELSE 0 END)),0x7171627671,FLOOR(RAND(0)*2)) HAVING MIN(0)#"" -8115 OR 1 GROUP BY CONCAT(0x716a787a71,(SELECT (CASE WHEN (3900=3900) THEN 1 ELSE 0 END)),0x7171627671,FLOOR(RAND(0)*2)) HAVING MIN(0)#"" -2949 OR 1 GROUP BY CONCAT(0x716a787a71,(SELECT (CASE WHEN (3900=3900) THEN 1 ELSE 0 END)),0x7171627671,FLOOR(RAND(0)*2)) HAVING MIN(0)#"" -4609) WHERE 5091=5091 OR 1 GROUP BY CONCAT(0x716a787a71,(SELECT (CASE WHEN (3900=3900) THEN 1 ELSE 0 END)),0x7171627671,FLOOR(RAND(0)*2)) HAVING MIN(0)#"" 1 having 1=1 1 having 1 1 having 1=1 1 having id=id I am having trouble -.- "; RegexOptions options = 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