#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?mi)\b(?:food(?: (?:microbiology|safety))?|microbiology and food)\b"
Local $sString = "Welcome to MOOC on Food Microbiology and Food Safety. I am Dr. xyz, Coordinator of this course, which is designed under the guidance of Prof. pqrs."
Local $sSubst = "<span title="" data-term="T: $&" class="grams">$&</span>"
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