How to check if string is a-Z 0-9 and -

[Psychotomus1]

how can I check if a string is a-Z 0-9 and the - symbol.

[kendo1979]

use preg_match

preg_match ( string pattern, string subject [, array &matches [, int flags [, int offset]]] )

[krt]

The pattern you need is /^[a-z0-9-]+$/i or you can do the opposite:
if (!preg_match("/[^a-z0-9-]/", ...

[Psychotomus1]

thanks krt.