How to check if the input string is a valid Regular expression?

Question

How do you check, in JavaScript, if a string is a proper regular expression that will compile?

For example, when you execute the following javascript, it produces a

Answer 1

function isRegExp(regExp){
          try {
                new RegExp(regExp);
              } catch(e) {
                return false
              }
         return true
    }

ex:
isRegExp(/@(\w+)/g) = true