#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?si)<(a|h1)\b.*?</\1>(*SKIP)(*F)|(222)"
Local $sString = "<p>111 222 333</p>" & @CRLF & _
"<li>111 222 333</li>" & @CRLF & _
"<h1>111 222 333</h1>" & @CRLF & _
"<h2>111 222 333</h2>" & @CRLF & _
"<strong>111 222 333</strong>" & @CRLF & _
"<p><strong>111 222 333</strong></p>" & @CRLF & _
"<p>111 <a href="">222</a> 333</p>"
Local $sSubst = "<a href="#link">\2</a>"
Local $sResult = StringRegExpReplace($sString, $sRegex, $sSubst)
MsgBox($MB_SYSTEMMODAL, "Result", $sResult)
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