#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "\<h1(.*(class="(?P<class>.+)"?).*|)\>(?P<text>[^\<]+)\<\/h1\>"
Local $sString = "<h1" & @CRLF & _
" class="sdkfjh">fhgkfg</h1>" & @CRLF & _
"<h1 class='sdkfjh'>askjdhsdkj</h1>" & @CRLF & _
"<h1" & @CRLF & _
"style="gjh" class="sdkfjh">askjdhsdkj</h1>"
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