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

Code Generator

Generated Code

#include <StringConstants.au3> ; to declare the Constants of StringRegExp #include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate Local $sRegex = "(?m)^(?:ftp|https?):\/\/(?!0\.0\.0\.0$)(?:(?:(?:1?\d\d?|2[0-4]\d|25[0-5])(?:\.(?!$))?){4}|(?:[a-zA-Z\d]\.|[a-zA-Z\d](?:(?![-.]{2})[a-zA-Z\d-]){0,63}?[a-zA-Z\d]\.){1,63}?[a-z]{2,63})(?:[:/].*)?$" Local $sString = "---- GOOD ----" & @CRLF & _ "http://10.25.41.81:6000/api/File/GetContentResult?ObjectId=62ab059f5045ea0bb69e00d9" & @CRLF & _ "http://10.25.41.81:6600/api/File/GetContentResult?ObjectId=62ab0d9e5045ea0bb69e00e4" & @CRLF & _ "http://10.25.41.81:6600/api/File/GetContentResult?ObjectId=62a89a8c4f3326cc410c40ef" & @CRLF & _ "http://10.25.41.33:6600/api/File/GetContentResult?ObjectId=62ab04855045ea0bb69e00d7" & @CRLF & _ "https://websitebuilders.com" & @CRLF & _ "https://www.fceboo.k.com/Learn-the-Net-330002341216/" & @CRLF & _ "ftp://aeneas.m.it.edu/" & @CRLF & _ "https://en.wkip.ed-i.org/wiki/Internet#Terminolog" & @CRLF & _ "http://foo.com/blah_blah" & @CRLF & _ "http://foo.com/blah_blah/" & @CRLF & _ "http://foo.com/blah_blah_(wikipedia)" & @CRLF & _ "http://foo.com/blah_blah_(wikipedia)_(again)" & @CRLF & _ "http://www.example.com/wpstyle/?p=364" & @CRLF & _ "https://www.example.com/foo/?bar=baz&inga=42&quux" & @CRLF & _ "http://a.ws/䨹" & @CRLF & _ "http://foo.com/blah_(wikipedia)#cite-1" & @CRLF & _ "http://foo.com/blah_(wikipedia)_blah#cite-1" & @CRLF & _ "http://foo.com/unicode_(✪)_in_parens" & @CRLF & _ "http://foo.com/(something)?after=parens" & @CRLF & _ "http://code.google.com/events/#&product=browser" & @CRLF & _ "http://js.mp" & @CRLF & _ "ftp://foo.bar/baz" & @CRLF & _ "http://foo.bar/?q=Test%20URL-encoded%20stuff" & @CRLF & _ "http://1337.net" & @CRLF & _ "http://a.b-c.de" & @CRLF & _ "http://223.255.255.254" & @CRLF & _ "https://example.com/././foo" & @CRLF & _ "https://EXAMPLE.com/../x" & @CRLF & _ "https://example.org//" & @CRLF & _ "https://example.org/foo bar" & @CRLF & _ "http://foo.bar/foo(bar)baz quux" & @CRLF & _ "https://example.com:demo" & @CRLF & _ "https://r.com/r/zxVH" & @CRLF & _ "" & @CRLF & _ "---- BAD ----" & @CRLF & _ "https://user:password@example.org/" & @CRLF & _ "http://userid:password@example.com:8080" & @CRLF & _ "http://userid:password@example.com:8080/" & @CRLF & _ "http://userid:password@example.com" & @CRLF & _ "http://userid:password@example.com/" & @CRLF & _ "http://userid@example.com" & @CRLF & _ "http://userid@example.com/" & @CRLF & _ "http://userid@example.com:8080" & @CRLF & _ "http://userid@example.com:8080/" & @CRLF & _ "file://loc%61lhost/" & @CRLF & _ "http://⌘.ws" & @CRLF & _ "http://⌘.ws/" & @CRLF & _ "http://☺.damowmow.com/" & @CRLF & _ "http://✪df.ws/123" & @CRLF & _ "http://[www.example.com]/" & @CRLF & _ "https://ex ample.org/" & @CRLF & _ "file://C|/demo" & @CRLF & _ "\example\..\demo/.\" & @CRLF & _ "https:example.org" & @CRLF & _ "https://////example.com///" & @CRLF & _ "http://0.0.0.0" & @CRLF & _ "http://3628126748" & @CRLF & _ "http://www.foo.bar./" & @CRLF & _ "http://a.b-.co" & @CRLF & _ "http://-a.b.co" & @CRLF & _ "http://-error-.invalid/" & @CRLF & _ "http://~_!$&'()*+,;=:%40:80%2f::::::@example.com" & @CRLF & _ "http://" & @CRLF & _ "http://." & @CRLF & _ "http://.." & @CRLF & _ "http://../" & @CRLF & _ "http://?" & @CRLF & _ "http://??" & @CRLF & _ "http://??/" & @CRLF & _ "http://#" & @CRLF & _ "http://##" & @CRLF & _ "http://##/" & @CRLF & _ "http://foo.bar?q=Spaces should be encoded" & @CRLF & _ "//" & @CRLF & _ "//a" & @CRLF & _ "///a" & @CRLF & _ "///" & @CRLF & _ "http:///a" & @CRLF & _ "foo.com" & @CRLF & _ "rdar://1234" & @CRLF & _ "h://test" & @CRLF & _ "http:// shouldfail.com" & @CRLF & _ ":// should fail" & @CRLF & _ "ftps://foo.bar/" & @CRLF & _ "http://.www.foo.bar/" & @CRLF & _ "http://.www.foo.bar./" & @CRLF & _ "" 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