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

`
`
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 = "((((?P<Keys>dword|word|byte|int)[ \n\t]+)((?P<Names>[a-zA-Z0-9 _\-\$]+)))((\[(?P<Range>[a-zA-Z0-9 \t\n]+)\][ \t\n]+)|(?P<Pointer>[* \t\n]+)|)((=[ \n\t]+)([&*"a-zA-Z0-9]+))(;))|(((?P<Others>int|string|word)[ \t\n]+)([a-zA-Z0-9\n\t]+)(;))" Local $sString = "; When you use static method ;;; " & @CRLF & _ "dword moses = 25;" & @CRLF & _ "word $him-moses_christ = 344;" & @CRLF & _ "byte second[ 20 ] = 89;" & @CRLF & _ "int th * = "moses";" & @CRLF & _ "int moses;" & @CRLF & _ "int moses = "christ";" & @CRLF & _ "int moses [54] = christ;" & @CRLF & _ "calls with a large number of" & @CRLF & _ "regular expressions. " & @CRLF & _ "By default, the regular expression engine caches " & @CRLF & _ "the 15 most recently used static regular expressions. " & @CRLF & _ "If your application uses more than 15 static regular expressions, " & @CRLF & _ "some regular expressions must be recompiled. To prevent this recompilation," & @CRLF & _ " you can increase the Regex.CacheSize property.(\[([a-zA-Z0-9 ]+)\])|([*]+)|[])" 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