#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "<div class\="custom">(.*?)<\/div>"
Local $sString = "<div><div class="custom"><p>TEST</p><div>Another inner div</div><div class="another-class">Some text</div></div></div>" & @CRLF & _
"<p>Another text</p>" & @CRLF & _
"<div><div class="hello"><div class="custom another" data-custom="test-data"><div>Another inner div</div><p>TEST</p><div class="another-class">Some text</div></div></div></div>"
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