#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "<a .*?<\/a>"
Local $sString = "<a href="[nggallery id=xx]"><span class="shutterset"><img class="alignnone size-large wp-image-23067" title="Image Title" src="http://example.com/wp-content/uploads/2015/06/image-title.jpg" alt="" width="685" height="456" /></span></a>" & @CRLF & _
" " & @CRLF & _
"<a href="[nggallery id=xxxxx]">Click here!</a>" & @CRLF & _
" " & @CRLF & _
"<a title="title title" href="[nggallery id=xxx]" target="_blank">Title Link Title Link</a>"
Local $aArray = StringRegExp($sString, $sRegex, $STR_REGEXPARRAYFULLMATCH)
; Present the entire match result
_ArrayDisplay($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