Question

This is my code but for some reason it doesn’t work anybody got a clue?

var val="My1name"
var exp = new RegExp("((?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,20})"); 
if(!val.match(exp)){      
   alert("No match")
} else {
   alert("Match")
}

Answer 1

You need to escape the escape characters when building from a string…

var exp = new RegExp("((?=.*\\d)(?=.*[a-z])(?=.*[A-Z]).{6,20})"); 
 //-------------------------^