Question

Possible Duplicate:
How to check for alphanumeric characters

Hai i validate the password in jquery using alphanumbercic.It validate only the letters,Suppose i typed only the numbers it allowed .Kindly guide me

problem

Without using letters it allowed

coding

letters = /^[0-9a-zA-Z]+$/;   
            if(!password.value.match(letters))   
            {   
                alert('Password must be alphanumeric');   
                signupForm.password.focus();   
                return false;   
            }

Answer 1

If your password must contain all the cases: capital letters,small letters and numbers, then you need to create 3 regexps:

var regexps = [/[A-Z]/,   //capital letter
              /[a-z]/,    //small letter
              /\d/ ];     //numeric digit
//This regexp is for assuring that 
//password does not contain other symbols than alphanumerics
var nonAlphanumericRegExp = /[^0-9a-zA-Z]/;

then validate like this:

if(regexps.some(function(value){  return !value.test(password.value); }) ||
       nonAlphanumericRegExp.test(password.value)){
    alert('Password must be alphanumeric');   
    signupForm.password.focus();   
    return false; 
}

Live demo

docs:

Array.some()

RegExp.test()