The following code works perfectly on the browser: console.log(“abc> >”.replace(/>(?<!abc>)/gm, “<“)); However, when I run it on PHPDesktop V5.7 Windows it comes up with the following error: Uncaught SyntaxError: Invalid regular expression: />(?<!abc>)/: Invalid group This could be due to the older version of JavaScript I believe is running on this version of PHPDesktop, however,… Read More JavaScript RegEx working on browser however not working on PHPDesktop v5.7 Windows