I need check for special characters in one of my string (text) fields in a form.

How can I do this, except for a veryyyyy long "If" command listing all the possible characters?

Any build-in function?

I've tried 

if (input.Insurance_Type.contains("[/\-\(\)_@#\^!\$%\&\*:;`~ ]"))

{

    alert "Special characters are not allowed in Insurance type field, please re-enter";

}

Both on field -> on user input and on the form's "On validate" - but nothing happened

Ravid