javascript - 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

 /^(?=^[^0-9]*$)(?=[a-zA-Z0-9]+)$/

but it is not working very well.

Answer 1

Use

/^(?![0-9]*$)[a-zA-Z0-9]+$/

This expression has a negative lookahead to verify that the string is not only numbers. See it in action with RegExr.