Regular Expression for any number divisible by 60 using C# .Net?

Question

I need to apply validation on input time intervals that are taken in as seconds. Now i am not really good at Regular expressions. So can any body help making a regular expre

Answer 1

I've come up with this:

^((?=[^147]*(([147][^147]*){3})*$)(?=[^258]*(([258][^258]*){3})*$)|(?=[^147]*(([147][^147]*){3})*[147][^147]*$)(?=[^258]*(([258][^258]*){3})*[258][^258]*$)|(?=[^147]*(([147][^147]*){3})*([147][^147]*){2}$)(?=[^258]*(([258][^258]*){3})*([258][^258]*){2}$))\d*0(?<=[02468][048]|[13579][26]|^0)$

Note: I didn't use non-capturing groups for the sake of simplicity.

Edit: Shorter version:

^(?=[^147]*(?:(?:[147][^147]*){3})*(?:()|([147][^147]*)|((?:[147][^147]*){2}))$)(?=[^258]*(?:(?:[258][^258]*){3})*(?:()|([258][^258]*)|((?:[258][^258]*){2}))$)((?(1)(?(4)|.$)|.$)|(?(2)(?(5)|.$)|.$)|(?(3)(?(6)|.$)|.$))\w*0(?<=[02468]0|^0)$