Regular Expressions 101

Save & Share

  • Save new Regex
    ctrl+s
  • Update 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
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
  • Match everything enclosed
    (?:...)
  • Capture everything enclosed
    (...)
  • 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

/
/
g

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 = "(?<!\d[- \/.])(?<!\d)(3[01]|[12][0-9]|0?[1-9])[- \/.](1[012]|0?[1-9])[- \/.](?:\d{2})?(\d?\d)(?![- \/.]?\d)" Local $sString = "Correct:" & @CRLF & _ "01/01/2000" & @CRLF & _ "01/Jan/2000" & @CRLF & _ "31/01/2000" & @CRLF & _ "31/Jan/2000" & @CRLF & _ "31.Jan.2000" & @CRLF & _ "31-Jan-2000" & @CRLF & _ "01/1/2000 x form" & @CRLF & _ "01/Jan/2000" & @CRLF & _ "01/1/01 x form" & @CRLF & _ "01/Jan/01" & @CRLF & _ "29/02/2000 x date" & @CRLF & _ "29/Feb/2000" & @CRLF & _ "28/02/2001" & @CRLF & _ "28/Feb/2001" & @CRLF & _ "30/04/2000" & @CRLF & _ "30/Apr/2000" & @CRLF & _ "31/07/2000" & @CRLF & _ "31/Jul/2000" & @CRLF & _ "31/08/2000" & @CRLF & _ "31/Aug/2000" & @CRLF & _ "01/12/2000" & @CRLF & _ "01/Dec/2000" & @CRLF & _ "" & @CRLF & _ "31-01-8888 ?" & @CRLF & _ "02/Jan-1984" & @CRLF & _ "1.1.0 x form" & @CRLF & _ "10.11.12" & @CRLF & _ "" & @CRLF & _ "all catched as x form" & @CRLF & _ "0,0,0" & @CRLF & _ "test 31.100.1952" & @CRLF & _ "32/03/18" & @CRLF & _ "1.2.3" & @CRLF & _ "123.2.12" & @CRLF & _ "_22.02.18_" & @CRLF & _ "22-02-18test" & @CRLF & _ "22/02-18" & @CRLF & _ "22//02/18" & @CRLF & _ "22 02-18" & @CRLF & _ "22:02:18" & @CRLF & _ "1,2,3" & @CRLF & _ "" & @CRLF & _ "False:" & @CRLF & _ "32/01/2000 x form" & @CRLF & _ "32/Jan/2000" & @CRLF & _ "01/15/2000 x form" & @CRLF & _ "29/02/2001 x date" & @CRLF & _ "29/Feb/2001" & @CRLF & _ "29/02/1900 x date" & @CRLF & _ "31/04/2000 x date" & @CRLF & _ "31/Apr/2000" & @CRLF & _ "31/09/2000 x date" & @CRLF & _ "31/Sep/2000" & @CRLF & _ "1.2.3-4" & @CRLF & _ "1-2-3.4" & @CRLF & _ "10.10.10.10" & @CRLF & _ "2w4w6" & @CRLF & _ "" & @CRLF & _ "... falls on the date of 10.11.12." & @CRLF & _ "... it.10.11.12 has some type - there should be a whitespace but ...." 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