Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • 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

/
/

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 = "^[\s\S]*?(?=\n{2,})" Local $sString = "The War of the Worlds" & @CRLF & _ "10-10-2020" & @CRLF & _ "" & @CRLF & _ "I." & @CRLF & _ "THE EVE OF THE WAR." & @CRLF & _ "" & @CRLF & _ "No one would have believed in the last years of the nineteenth century" & @CRLF & _ "that this world was being watched keenly and closely by intelligences" & @CRLF & _ "greater than man’s and yet as mortal as his own; that as men busied" & @CRLF & _ "themselves about their various concerns they were scrutinised and" & @CRLF & _ "studied, perhaps almost as narrowly as a man with a microscope might" & @CRLF & _ "scrutinise the transient creatures that swarm and multiply in a drop of" & @CRLF & _ "water. With infinite complacency men went to and fro over this globe" & @CRLF & _ "about their little affairs, serene in their assurance of their empire" & @CRLF & _ "over matter. It is possible that the infusoria under the microscope do" & @CRLF & _ "the same. No one gave a thought to the older worlds of space as sources" & @CRLF & _ "of human danger, or thought of them only to dismiss the idea of life" & @CRLF & _ "upon them as impossible or improbable. It is curious to recall some of" & @CRLF & _ "the mental habits of those departed days. At most terrestrial men" & @CRLF & _ "fancied there might be other men upon Mars, perhaps inferior to" & @CRLF & _ "themselves and ready to welcome a missionary enterprise. Yet across the" & @CRLF & _ "gulf of space, minds that are to our minds as ours are to those of the" & @CRLF & _ "beasts that perish, intellects vast and cool and unsympathetic," & @CRLF & _ "regarded this earth with envious eyes, and slowly and surely drew their" & @CRLF & _ "plans against us. And early in the twentieth century came the great" & @CRLF & _ "disillusionment." & @CRLF & _ "" Local $aArray = StringRegExp($sString, $sRegex, $STR_REGEXPARRAYFULLMATCH) ; Present the entire match result _ArrayDisplay($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