Regex: only alphanumeric but not if this is pure numeric

Question

For instance:

\'1\'     => NG
\'243\'   => NG
\'1av\'   => OK
\'pRo\'   => OK
\'123k%\' => NG

I tried with

Answer 1

Try with this:

/^(?!^\d*$)[a-zA-Z\d]*$/

Edit: since this is essentially the same of the accepted answer, I'll give you something different:

/^\d*[a-zA-Z][a-zA-Z\d]*$/

No lookaheads, no repeated complex group, it just verifies that there's at least one alphabetic character. This should be quite fast.

Answer 2

Try this: ^[a-zA-Z0-9]*[a-zA-Z]+[a-zA-Z0-9]*$

Answer 3

try with this: ^(?!\d+\b)[a-zA-Z\d]+$
(?!\d+\b) will avoid pure numeric, add \w+ then mix alphabet and number.

Answer 4

This should do the trick, without lookbehind:

^(\d*[a-zA-Z]\d*)+$

Answer 5

So we know that there must be at least one "alphabetic" character in there somewhere:

[a-zA-Z]

And it can have any number of alphanumeric characters (including zero) either before it or after it, so we pad it with [a-zA-Z0-9]* on both sides:

/^[a-zA-Z0-9]*[a-zA-Z][a-zA-Z0-9]*$/

That should do the trick.

Answer 6

this is strictly alphanumeric

String name="^[^a-zA-Z]\\d*[a-zA-Z][a-zA-Z\\d]*$";