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

/
/
gxi

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 = "(?xi)[ptkmnlswj]?" & @CRLF & _ "(?:(?<=w)[aei]|" & @CRLF & _ "(?<=[jt])[aeou]|" & @CRLF & _ "(?<=[pkmnls])[aeiou]|" & @CRLF & _ "(?<=\b)[aeiou])" & @CRLF & _ "(?:n(?![nm]?[aeiou]))?" Local $sString = "#Sanity Checks:" & @CRLF & _ "---" & @CRLF & _ "toki pona" & @CRLF & _ "nanpa wan" & @CRLF & _ "toki li pona mama tuliwan sulisuli " & @CRLF & _ "mi olin e sina" & @CRLF & _ "---" & @CRLF & _ "" & @CRLF & _ "#These should not work:" & @CRLF & _ "---" & @CRLF & _ "titijiji" & @CRLF & _ "tanna" & @CRLF & _ "nanma" & @CRLF & _ "---" & @CRLF & _ "" & @CRLF & _ "#Some sentences from Wikipesija page for Linguistics:" & @CRLF & _ "---" & @CRLF & _ "toki Inli (kepeken toki Inli: EngLish) li toki suli." & @CRLF & _ "toki Inli li kama tan ma Piten. taso tenpo ni la jan li kepeken kin e toki Inli lon ma Mewika lon ma Kanata lon ma Oselija lon ma Nusilan. jan li toki kin e toki Inli lon ma ante mute. toki Inli li toki pi ma sike. toki Inli li jo e kepeken mute." & @CRLF & _ "---" & @CRLF & _ "a an e en i in o on u un" & @CRLF & _ "pa pan pe pen pi pin po pon pu pun" & @CRLF & _ "ta tan te ten ti tin to ton tu tun" & @CRLF & _ "ka kan ke ken ki kin ko kon ku kun" & @CRLF & _ "ma man me men mi min mo mon mu mun" & @CRLF & _ "na nan ne nen ni nin no non nu nun" & @CRLF & _ "sa san se sen si sin so son su sun" & @CRLF & _ "ja jan je jen ji jin jo jon ju jun" & @CRLF & _ "la lan le len li lin lo lon lu lun" & @CRLF & _ "wa wan we wen wi win wo won wu wun" & @CRLF & _ "" & @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