To check if a string is alphanumeric in javascript

Question

I want to check if a string is STRICTLY ALPHANUMERIC in javascript. i have tried this:

var Exp = /^[0-9a-z]+$/;
if(!pwd.match(Exp))
alert("ERROR")

But the problem with this is it passes input sting if it contains all alphabet or all numeric, i want the function to pass if it contains both Characters and Numbers.

Answer 1

Try this regex:

/((^[0-9]+[a-z]+)|(^[a-z]+[0-9]+))+[0-9a-z]+$/i

Which allows only Alphanumeric.

It doesn't allow:

• Only Alpha
• Only Numbers

Refer LIVE DEMO

Updated:

Below regex allows:

/^([0-9]|[a-z])+([0-9a-z]+)$/i

• AlphaNumeric
• Only Alpha
• Only Numbers