Question

I am looking for a JavaScript function that checks for the following characters (without commas) in a string. If they are present, it would return false, else returns true.

<,>,(,),#,"",',:,::

Answer 1

function (str) { 
   return ! (/[<>()#':]|""/.test(str));
}

any set of single characters can put put inside a [set of brackets]. For longer patterns, use the pipe.

edit: as patrick pointed out, if you’re checking for : you don’t need to check for :: separately.