Question

What’s the most efficient way to check if a JavaScript string has special characters? I am trying to use a loop and checking various characters, but that does not seem very efficient, nor does it catch all characters.

Specifically, the goal is to check if a string contains any characters except A-Z, and 0-9, excluding Q and R.

Answer 1

Look into using a regular expression and the .test() method.

.test():

Executes the search for a match between a regular expression and a
specified string. Returns true or false.

RegExp may also be helpful, but it’s not a standard.

Regular Expression Cheat Sheet