How do you use a regular expression in replace function?




regexp (pattern)

A RegExp object or literal. The match or matches are replaced with newSubStr or the value returned by the specified function.

Instead of using the /g syntax, you can construct a new RegExp object: 

(/g uisng for global string change)

var re = "3001/A/18716520/000/00";

var re = new RegExp("/", "g");

var Response = re.replace(ch, '_');

Result:

3001_A_18716520_000_00