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

/
/
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 $sRegex = "(?m)^(I[VX]|VI{0,3}|I{1,3})|((X[LC]|LX{0,3}|X{1,3})(I[VX]|V?I{0,3}))|((C[DM]|DC{0,3}|C{1,3})(X[LC]|L?X{0,3})(I[VX]|V?I{0,3}))|(M+(C[DM]|D?C{0,3})(X[LC]|L?X{0,3})(I[VX]|V?I{0,3}))$" Local $sString = "I" & @CRLF & _ "II" & @CRLF & _ "III" & @CRLF & _ "IV" & @CRLF & _ "V" & @CRLF & _ "VI" & @CRLF & _ "VII" & @CRLF & _ "VIII" & @CRLF & _ "IX" & @CRLF & _ "X" & @CRLF & _ "XI" & @CRLF & _ "XII" & @CRLF & _ "XIII" & @CRLF & _ "XIV" & @CRLF & _ "XV" & @CRLF & _ "XVI" & @CRLF & _ "XVII" & @CRLF & _ "XVIII" & @CRLF & _ "XIX" & @CRLF & _ "XX" & @CRLF & _ "XLIV" & @CRLF & _ "XLIX" & @CRLF & _ "LXXIX" & @CRLF & _ "XCIV" & @CRLF & _ "XCIX" & @CRLF & _ "C" & @CRLF & _ "CI" & @CRLF & _ "CII" & @CRLF & _ "CIII" & @CRLF & _ "CIV" & @CRLF & _ "CVI" & @CRLF & _ "CIX" & @CRLF & _ "CD" & @CRLF & _ "CM" & @CRLF & _ "CC" & @CRLF & _ "CCC" & @CRLF & _ "D" & @CRLF & _ "DC" & @CRLF & _ "DCC" & @CRLF & _ "DCCC" & @CRLF & _ "CX" & @CRLF & _ "CXX" & @CRLF & _ "CXIX" & @CRLF & _ "CMXCIX" & @CRLF & _ "MCMXLIV" & @CRLF & _ "MMMMCCCXII" & @CRLF & _ "" & @CRLF & _ "" & @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