Regular Expressions 101

Save & Share

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

/
/
gm

Test String

Code Generator

Generated Code

#include <StringConstants.au3> ; to declare the Constants of StringRegExp #include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate Local $sRegex = "(?m)(?:\"(?:(?<=\"(?=[^\n]))[^\n]+?(?=(?<!\\))(?=\"))?\")|(\B'(?:(?<='(?=[^\n]))[^\n]+?(?=(?<!\\))(?='))?')" Local $sString = "" & @CRLF & _ "1. Valid double-quoted strings:" & @CRLF & _ " - "Hello"" & @CRLF & _ " - "This is a test"" & @CRLF & _ " - "123"" & @CRLF & _ " - "Special characters: @#$%^&*()_+"" & @CRLF & _ " - "Escape sequence: \n"" & @CRLF & _ "" & @CRLF & _ "2. Valid double-quoted strings with additional characters or variables:" & @CRLF & _ " - " test aaaaa \" " + asdf" & @CRLF & _ " - " test " + ( "aaaaa" ) + gdf" & @CRLF & _ " - " test \" " + `" aaaa " + dfg" & @CRLF & _ " - " test ' aaaaa \" " + dfg" & @CRLF & _ " - """ & @CRLF & _ "" & @CRLF & _ "3. Valid double-quoted strings with special characters:" & @CRLF & _ " - "sas''as\"a1\'2 ! -_?:sa"" & @CRLF & _ " - "''"" & @CRLF & _ " - "\abnb\ajhgf\crt098& \"'"" & @CRLF & _ "" & @CRLF & _ "4. Invalid double-quoted strings:" & @CRLF & _ " - " test " + ( "aaaaa" ) \" saf" & @CRLF & _ " - "\\ + \* test " \$ \. dsdfs" & @CRLF & _ " - (\" test \" " + " aaaa " sfgd" & @CRLF & _ " - ' test ' + aas ( "aaaaa" ) + '\ sd" & @CRLF & _ " - '\\ + \* test ' \$ \. trace" & @CRLF & _ " - (' test ' as ' + ' aaaa '" & @CRLF & _ " - '""'" & @CRLF & _ " - '"sas'" & @CRLF & _ " - 'ads'" & @CRLF & _ " - 'asdasd\"asdsa'" & @CRLF & _ " - "klkl"klkl" & @CRLF & _ " - "asa\'sasa\\"" & @CRLF & _ " - \'\\\'" & @CRLF & _ " - "hhhh"klkl"" & @CRLF & _ " - 'jkjkjk'klklk'" & @CRLF & _ " - '\"\\\"'" & @CRLF & _ " - ''" & @CRLF & _ " - '\"asa\'sasa\\\"'" & @CRLF & _ " - "sasasasa\\\\\\"" & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "1. Valid single-quoted strings:" & @CRLF & _ " - 'Hello'" & @CRLF & _ " - 'This is a test'" & @CRLF & _ " - '123'" & @CRLF & _ " - 'Special characters: @#$%^&*()_+'" & @CRLF & _ " - 'Escape sequence: \n'" & @CRLF & _ "" & @CRLF & _ "2. Valid single-quoted strings with additional characters or variables:" & @CRLF & _ " - ' test aaaaa \' ' + asdf" & @CRLF & _ " - ' test ' + ( 'aaaaa' ) + gdf" & @CRLF & _ " - ' test \' ' + ' aaaa' + dfg" & @CRLF & _ " - ' test " aaaaa \' ' + dfg" & @CRLF & _ " - ''" & @CRLF & _ "" & @CRLF & _ "3. Valid single-quoted strings with special characters:" & @CRLF & _ " - 'sas""as\'a1\"2 ! -_?:sa'" & @CRLF & _ " - '""'" & @CRLF & _ " - '\abnb\ajhgf\crt098& \'""'" & @CRLF & _ "" & @CRLF & _ "4. Invalid single-quoted strings:" & @CRLF & _ " - ' test ' + ( 'aaaaa' ) \' saf" & @CRLF & _ " - '\\ + \* test ' \$ \. dsdfs" & @CRLF & _ " - (\' test \' + ' aaaa ' sfgd" & @CRLF & _ " - " test \" " + " aaaa " sfgd" & @CRLF & _ " - ' test ' + aas ( 'aaaaa' ) + '\ sd" & @CRLF & _ " - '\\ + \* test ' \$ \. trace" & @CRLF & _ " - (' test ' as ' + ' aaaa '" & @CRLF & _ " - "''"" & @CRLF & _ " - 'sas"" & @CRLF & _ " - "ads'" & @CRLF & _ " - 'asdasd\'asdsa'" & @CRLF & _ " - "klkl"klkl" & @CRLF & _ " - "asa\'sasa\\"" & @CRLF & _ " - \'\\\'" & @CRLF & _ " - 'hhhh"klkl\'\" & @CRLF & _ " - \'jkjkjk"klklk'" & @CRLF & _ " - "\'\\\'"" & @CRLF & _ " - ''" & @CRLF & _ " - '\"asa\'sasa\\\"'" & @CRLF & _ " - 'sasasasa\\\\\\'" & @CRLF & _ "" Local $aArray = StringRegExp($sString, $sRegex, $STR_REGEXPARRAYGLOBALFULLMATCH) Local $aFullArray[0] For $i = 0 To UBound($aArray) -1 _ArrayConcatenate($aFullArray, $aArray[$i]) Next $aArray = $aFullArray ; Present the entire match result _ArrayDisplay($aArray, "Result")

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 AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm