#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "(?m)^((\()(?1)?(\))(?1)?)$"
Local $sString = "//SHOULD" & @CRLF & _
"()" & @CRLF & _
"(())" & @CRLF & _
"((()))" & @CRLF & _
"()()" & @CRLF & _
"(())()" & @CRLF & _
"()()()" & @CRLF & _
"()()()()()" & @CRLF & _
"(((())))" & @CRLF & _
"()((()))" & @CRLF & _
"()()()()((()))(())((()))(((((((())))))))" & @CRLF & _
"" & @CRLF & _
"" & @CRLF & _
"//NOT" & @CRLF & _
"(" & @CRLF & _
")" & @CRLF & _
")(" & @CRLF & _
"))((" & @CRLF & _
")()(" & @CRLF & _
"(()" & @CRLF & _
"))" & @CRLF & _
"())" & @CRLF & _
"(()" & @CRLF & _
"()()())" & @CRLF & _
"()())" & @CRLF & _
")))))))))" & @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