regex replace or code example

Example: replace many chracters js

// You can use regex to do it in only one replace
// Using the or: |
var str = '#this #is__ __#a test###__';
str.replace(/#|_/g,''); // result: "this is a test"
// Or using the character class 
str.replace(/[#_]/g,''); // result: "this is a test"