Regex for alphanumber string

Question

I am trying to match a alphanumber string that MUST have numbers and MUST have letters in it.

How do I do that?

So exactly which characters are allowed in an alphanumber string? Are spaces allowed? How about newlines or periods? How about Unicode "letters" from another language? Please be more precise and give examples of strings you want to match and examples of strings you do NOT want to match. — ridgerunner
– ridgerunner, Commented Dec 12, 2011 at 22:54

FailedDev · Accepted Answer · 2011-12-12 17:47:02Z

1

Use lookaheads:

^(?=.*\d)(?=.*[a-zA-Z]).*$

In order for this match to succeed at least one ASCII number and at least on ASCII letter must be a part of the string.

answered Dec 12, 2011 at 17:47

FailedDev

27k9 gold badges56 silver badges74 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Gyrfalcon2138 · Accepted Answer · 2011-12-12 17:42:53Z

1

The first thing that comes to mind would be a regex like this:

(\d.*[a-zA-Z].* | [a-zA-Z].*\d.*)

So, a digit, anything, and a letter somewhere, or a letter, anything and a digit somewhere with no beginning or end of string markings.

It's super broad, but does that help at all?

answered Dec 12, 2011 at 17:42

Gyrfalcon2138

3623 silver badges14 bronze badges