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
No Match

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox Local $sRegex = "(?m)(.*)(-)(.*)(-)(.*)" Local $sString = "10-10-2017" & @CRLF & _ "10-10-2017" & @CRLF & _ "10-10-2017" & @CRLF & _ "10-1-2018" & @CRLF & _ "10-1-2018" & @CRLF & _ "10-1-2018" & @CRLF & _ "10-1-2018" & @CRLF & _ "10-1-2018" & @CRLF & _ "10-1-2018" & @CRLF & _ "10-2-2018" & @CRLF & _ "10-2-2018" & @CRLF & _ "10-2-2018" & @CRLF & _ "10-3-2018" & @CRLF & _ "10-3-2018" & @CRLF & _ "10-7-2017" & @CRLF & _ "10-7-2017" & @CRLF & _ "10-7-2017" & @CRLF & _ "10-7-2017" & @CRLF & _ "10-7-2017" & @CRLF & _ "10-7-2017" & @CRLF & _ "10-7-2017" & @CRLF & _ "10-8-2017" & @CRLF & _ "10-8-2017" & @CRLF & _ "10-8-2017" & @CRLF & _ "10-8-2017" & @CRLF & _ "10-9-2017" & @CRLF & _ "10-9-2017" & @CRLF & _ "1-10-2017" & @CRLF & _ "1-10-2017" & @CRLF & _ "1-10-2017" & @CRLF & _ "1-10-2017" & @CRLF & _ "11-10-2017" & @CRLF & _ "11-10-2017" & @CRLF & _ "11-11-2017" & @CRLF & _ "11-11-2017" & @CRLF & _ "11-11-2017" & @CRLF & _ "11-11-2017" & @CRLF & _ "1-112017" & @CRLF & _ "1-11-2017" & @CRLF & _ "1-11-2017" & @CRLF & _ "1-11-2017" & @CRLF & _ "1-11-2017" & @CRLF & _ "1-11-2017" & @CRLF & _ "11-1-2018" & @CRLF & _ "11-1-2018" & @CRLF & _ "11-1-2018" & @CRLF & _ "11-1-2018" & @CRLF & _ "1-1-2017" & @CRLF & _ "1-1-2018" & @CRLF & _ "1-1-2018" & @CRLF & _ "1-1-2018" & @CRLF & _ "11-2-2018" & @CRLF & _ "11-2-2018" & @CRLF & _ "11-2-2018" & @CRLF & _ "11-7-2017" & @CRLF & _ "12-11-2017" & @CRLF & _ "1-2-2018" & @CRLF & _ "1-2-2018" & @CRLF & _ "1-2-2018" & @CRLF & _ "1-2-2018" & @CRLF & _ "12-2-2018" & @CRLF & _ "12-2-2018" & @CRLF & _ "12-2-2018" & @CRLF & _ "12-2-2018" & @CRLF & _ "12-2-2018" & @CRLF & _ "12-2-2018" & @CRLF & _ "12-3-2018" & @CRLF & _ "12-3-2018" & @CRLF & _ "12-3-2018" & @CRLF & _ "12-3-2018" & @CRLF & _ "12-3-2018" & @CRLF & _ "12-3-2018" & @CRLF & _ "12-3-2018" & @CRLF & _ "12-7-2017" & @CRLF & _ "12-7-2017" & @CRLF & _ "12-7-2017" & @CRLF & _ "12-7-2017" & @CRLF & _ "12-7-2017" & @CRLF & _ "12-7-2017" & @CRLF & _ "12-7-2017" & @CRLF & _ "12-9-2017" & @CRLF & _ "13-11-2017" & @CRLF & _ "13-11-2017" & @CRLF & _ "13-11-2017" & @CRLF & _ "13-1-2018" & @CRLF & _ "13-1-2018" & @CRLF & _ "13-1-2018" & @CRLF & _ "1-3-2018" & @CRLF & _ "1-3-2018" & @CRLF & _ "13-6-2017" & @CRLF & _ "13-7-2017" & @CRLF & _ "13-7-2017" & @CRLF & _ "13-7-2017" & @CRLF & _ "13-7-2017" & @CRLF & _ "13-7-2017" & @CRLF & _ "13-7-2017" & @CRLF & _ "13-7-2017" & @CRLF & _ "13-8-2017" & @CRLF & _ "13-8-2017" & @CRLF & _ "13-8-2017" & @CRLF & _ "13-8-2017" & @CRLF & _ "13-8-2017" & @CRLF & _ "13-9-2017" & @CRLF & _ "13-9-2017" & @CRLF & _ "13-9-2017" & @CRLF & _ "14-10-2017" & @CRLF & _ "14-10-2017" & @CRLF & _ "14-10-2017" & @CRLF & _ "14-11-2017" & @CRLF & _ "14-11-2017" & @CRLF & _ "14-11-2017" & @CRLF & _ "14-1-2018" & @CRLF & _ "14-1-2018" & @CRLF & _ "1-4-2018" & @CRLF & _ "1-4-2018" & @CRLF & _ "1-4-2018" & @CRLF & _ "14-2-2018" & @CRLF & _ "14-3-2018" & @CRLF & _ "14-3-2018" & @CRLF & _ "14-3-2018" & @CRLF & _ "14-3-2018" & @CRLF & _ "14-3-2018" & @CRLF & _ "14-3-2018" & @CRLF & _ "14-7-2017" & @CRLF & _ "14-8-2017" & @CRLF & _ "14-8-2017" & @CRLF & _ "14-8-2017" & @CRLF & _ "15-10-2017" & @CRLF & _ "15-10-2017" & @CRLF & _ "15-11-2017" & @CRLF & _ "15-11-2017" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-1-2018" & @CRLF & _ "15-2-2018" & @CRLF & _ "15-2-2018" & @CRLF & _ "15-2-2018" & @CRLF & _ "15-2-2018" & @CRLF & _ "15-3-2018" & @CRLF & _ "15-3-2018" & @CRLF & _ "15-7-2017" & @CRLF & _ "15-7-2017" & @CRLF & _ "15-7-2017" & @CRLF & _ "15-7-2017" & @CRLF & _ "15-7-2017" & @CRLF & _ "16-10-2017" & @CRLF & _ "16-10-2017" & @CRLF & _ "16-10-2017" & @CRLF & _ "16-10-2017" & @CRLF & _ "16-11-2017" & @CRLF & _ "16-11-2017" & @CRLF & _ "16-11-2017" & @CRLF & _ "16-11-2017" & @CRLF & _ "16-1-2018" & @CRLF & _ "16-7-2017" & @CRLF & _ "16-7-2017" & @CRLF & _ "16-7-2017" & @CRLF & _ "16-8-2017" & @CRLF & _ "16-8-2017" & @CRLF & _ "16-9-2017" & @CRLF & _ "16-9-2017" & @CRLF & _ "16-9-2017" & @CRLF & _ "16-9-2017" & @CRLF & _ "16-9-2017" & @CRLF & _ "17-10-2017" & @CRLF & _ "17-10-2017" & @CRLF & _ "17-10-2017" & @CRLF & _ "17-11-2017" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-1-2018" & @CRLF & _ "17-2-2018" & @CRLF & _ "17-2-2018" & @CRLF & _ "17-2-2018" & @CRLF & _ "17-3-2018" & @CRLF & _ "17-3-2018" & @CRLF & _ "17-3-2018" & @CRLF & _ "17-7-2017" & @CRLF & _ "17-7-2017" & @CRLF & _ "17-7-2017" & @CRLF & _ "17-7-2017" & @CRLF & _ "17-7-2017" & @CRLF & _ "17-7-2017" & @CRLF & _ "17-9-2017" & @CRLF & _ "17-9-2017" & @CRLF & _ "17-9-2017" & @CRLF & _ "18-10-2017" & @CRLF & _ "18-10-2017" & @CRLF & _ "18-10-2017" & @CRLF & _ "18-10-2017" & @CRLF & _ "18-10-2017" & @CRLF & _ "18-11-2017" & @CRLF & _ "18-11-2017" & @CRLF & _ "18-1-2018" & @CRLF & _ "18-1-2018" & @CRLF & _ "18-1-2018" & @CRLF & _ "18-1-2018" & @CRLF & _ "18-1-2018" & @CRLF & _ "1-8-2017" & @CRLF & _ "1-8-2017" & @CRLF & _ "1-8-2017" & @CRLF & _ "1-8-2017" & @CRLF & _ "18-2-2018" & @CRLF & _ "18-3-2018" & @CRLF & _ "18-3-2018" & @CRLF & _ "18-3-2018" & @CRLF & _ "18-7-2017" & @CRLF & _ "18-7-2017" & @CRLF & _ "18-7-2017" & @CRLF & _ "18-7-2017" & @CRLF & _ "18-7-2017" & @CRLF & _ "18-7-2017" & @CRLF & _ "18-9-2017" & @CRLF & _ "19-10-2017" & @CRLF & _ "19-10-2017" & @CRLF & _ "19-10-2017" & @CRLF & _ "19-10-2017" & @CRLF & _ "19-10-2017" & @CRLF & _ "19-11-2017" & @CRLF & _ "19-11-2017" & @CRLF & _ "19-2-2018" & @CRLF & _ "19-2-2018" & @CRLF & _ "19-2-2018" & @CRLF & _ "19-3-2018" & @CRLF & _ "19-3-2018" & @CRLF & _ "19-3-2018" & @CRLF & _ "19-3-2018" & @CRLF & _ "19-3-2018" & @CRLF & _ "19-3-2018" & @CRLF & _ "19-8-2017" & @CRLF & _ "19-8-2017" & @CRLF & _ "19-8-2017" & @CRLF & _ "19-8-2017" & @CRLF & _ "20-1-2018" & @CRLF & _ "20-1-2018" & @CRLF & _ "20-1-2018" & @CRLF & _ "20-1-2018" & @CRLF & _ "20-1-2018" & @CRLF & _ "20-1-2018" & @CRLF & _ "20-1-2018" & @CRLF & _ "" Local $sSubst = "\5\4\3\2\1" Local $sResult = StringRegExpReplace($sString, $sRegex, $sSubst) MsgBox($MB_SYSTEMMODAL, "Result", $sResult)

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