Question

RegEx = new RegExp(sourcevalue, "gi");

temp[i] = Selectors[i].cssText.replace(RegEx, targetvalue);

where sourcevalue = rgb(255,0,0) and targetvalue = #FFFFFF, but sourcevalue is not replaced by targetvalue, why?

Answer 1

Because sourcevalue is a correct Javascript regular expression but it’s not working the way you expected. There are special characters in regular expression like the () parentheses. They are used to group parts of regular expressions. To use them with their “literal” meaing you’ll have to escape them using backslashes

var RegEx = /rgb\(255,0,0\)/gi;