#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?mi)\[([^\]]+)\]\(([^)]+(.md))\)"
Local $sString = "[test](test.md) [test](test.md) [test](test.md)" & @CRLF & _
"- [Standard Rewards](Standard%20Rewards.md)" & @CRLF & _
"- [Highest Exp Char](Exp%20Char.md)" & @CRLF & _
"- [Highest Exp Fairies](Crystals%20Fairy%20Exp.md)"
Local $sSubst = "$3"
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