#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "(?s)<span style=\"font-size:14px;\">([\w\s]+)(<\/span>)"
Local $sString = "<div class="Description_Productinfo" itemprop="description"><p><span style="color:#7f8c8d;"><span style="font-family:Arial,Helvetica,sans-serif;"><span style="font-size:14px;">Alphanumeric Words If You Wish To Match</span></span></span></p></div>" & @CRLF & _
""
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