Regular Expressions 101

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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

/
/
im

Test String

Code Generator

Language

Generated Code

#include <StringConstants.au3> ; to declare the Constants of StringRegExp #include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate Local $sRegex = "(?im)^subject:\s(.+)" Local $sString = "Received: from DOMAIN.mydomain.com (UnknownHost [127.0.0.1]) by DOMAIN.mydomain.net with SMTP;" & @CRLF & _ " Fri, 6 Sep 2013 10:34:07 -0600" & @CRLF & _ "Date: Fri, 6 Sep 2013 10:34:07 -0600 (MDT)" & @CRLF & _ "From: "MyDomain.com" " & @CRLF & _ "To: test@anotherdomain.com" & @CRLF & _ "Message-ID: <8279725.100.1378485247161.JavaMail.MYDOMAIN$@127.0.0.1>" & @CRLF & _ "Subject: Membership Activation" & @CRLF & _ "MIME-Version: 1.0" & @CRLF & _ "Content-Type: text/html; charset=UTF-8" & @CRLF & _ "Content-Transfer-Encoding: 7bit" & @CRLF & _ "Subject: Membership Activation" & @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