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

/
/
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)^(=?202\d)(\d{0,3}[A-Z]{1,4}|[A-Z]{1,4}\d{1,3})([\dA-Z]{0,4})A" Local $sString = "Matches R1 R2 R3 R4 R5 R6" & @CRLF & _ "2022A144A OK OK OK OK \D\d\d\d" & @CRLF & _ "20228BC3A OK OK OK OK \d\D\D\d" & @CRLF & _ "20228Z1DA OK OK OK OK \d\D\d\D" & @CRLF & _ "2022K2 A " & @CRLF & _ "20229999A NOK \d\d\d\d" & @CRLF & _ "2022B123A OK OK OK OK \D\d\d\d" & @CRLF & _ "20221B23A OK OK OK OK \d\D\d\d" & @CRLF & _ "202212B3A NOK NOK NOK OK OK \d\d\D\d" & @CRLF & _ "2022123BA NOK OK \d\d\d\D" & @CRLF & _ "2022ABCDA " & @CRLF & _ "2022K2 A " & @CRLF & _ "" & @CRLF & _ "Matches 100% as desired" & @CRLF & _ "R 12 2022(\d\D\w\w|\D\d\w\w|\d\d\D\w|\d\d\w\D|\D\D\D\D)A" & @CRLF & _ "R 13 ^(=?202\d)(\d{0,3}[A-Z]{1,4}|[A-Z]{1,4}\d{1,3})([\dA-Z]{0,4})A" & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "Should match" & @CRLF & _ "R1: 2022\d\D\w\wA" & @CRLF & _ "R2: 2022\D\d\w\wA" & @CRLF & _ "R3: 2022(\d\D\w\w|\D\d\w\w)A" & @CRLF & _ "R4: 2022(\d\D\w\w|\D\d\w\w|\d\d\D\w)A" & @CRLF & _ "R5: 2022(\d\D\w\w|\D\d\w\w|\d\d\D\w|\d\d\w\D)A" & @CRLF & _ "" & @CRLF & _ "R 10 ^(=?202\d)(\d*[A-Z]|[A-Z]*)([\dA-Z]{1,3})A" & @CRLF & _ "R 11 ^(=?202\d)(\d{1,3}[A-Z]*)([\dA-Z]{1,3})A" & @CRLF & _ "R 12 ^(=?202\d)(\d{1,3}[A-Z]{1,3}|[A-Z]{1,3}\d{1,3})([\dA-Z]{0,3})A" & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "^ Start of string" & @CRLF & _ "(?=[a-z\d]{8,}$) Positive lookahead, assert 8 or more chars a-z or digits till end of string" & @CRLF & _ "(?=\d*[a-z]) Positive lookahead to assert at least a char a-z" & @CRLF & _ "[a-z]* Match optional chars a-z" & @CRLF & _ "\d Match at least a single digit" & @CRLF & _ "[a-z\d]* Match optional chars a-z or digits" & @CRLF & _ "$ End of string" & @CRLF & _ "" & @CRLF & _ "Should not match" & @CRLF & _ "R6: 2022([A-Z0-9]{1,4})A" & @CRLF & _ "R7: 2022(\d|\w){1,3}\wA <-- also matches 20229999A which it should not" & @CRLF & _ "R8: 2022\w\w\s\sA" & @CRLF & _ "R9 2022\d\d\d\dA" 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