I want to check the given string is alphanumeric or not. i.e. the expected output is as follows

• 123 should retun false
• abc should retun false
• a123 should retun true
• 1a23 should retun true

I tried with the ^[a-zA-Z0-9]*$ regex. It is not working as expected. Can anyone suggest the working peggyjs regex? Thanks.

CodePudding user response：

You can assert not only digits, and match at least a single digit restricticting to match to only a-z or a digit.

Using a case insensitive match:

^(?!\d $)[a-z]*\d[a-z\d]*$

Regex demo

CodePudding user response：

If you know the order (letters then numbers for example) you can do .*[a-zA-Z].*[0-9]

But I assume you can't make such assumptions so I would use the slightly more complex ^(?=.*[a-zA-Z])(?=.*[0-9]).* which means "a letter somewhere later, and also a number somewhere later".

PS : you can replace all [0-9] by \d if you like.

Edit : that's only assuming you don't get other kinds of characters, use Alireza's regex instead if you need to.