#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "(?:<(style)(?:\s+(?=((?:"[\S\s]*?"|'[\S\s]*?'|(?:(?!\/>)[^>])?)+))\2)?\s*>)([\S\s]*?)<\/\1\s*>"
Local $sString = "const str1 = '<style> div { color: red; } a { color: green; } </style>hello<div></div><div><a>hello</a></div>'" & @CRLF & _
"const str2 = '<style> div { color: red; } div > a { color: green; } </style>hello<div></div><div><a>hello</a></div>'" & @CRLF & _
"" & @CRLF & _
"const regex = /<style[^>]*>([^>]*?)<\/style>/g" & @CRLF & _
"" & @CRLF & _
"const matches1 = str1.match(regex) // returns a match" & @CRLF & _
"const matches2 = str2.match(regex) // does NOT return a match" & @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