Regexpr

[fabi]

How I define one regexp with the following rule? The first one caracter must be a number or the letter ' p ' and the too much characters must be numerical.
This will be being verified in onkeypress.

[Jeff Mott]

and the too much characters must be numericalI'm taking this to mean all characters after the first must be numerical digits./[\dp]\d+/i

[Charles]

I think that you need something more like /^[\dp]\d+$/i.