On Sep 9, 2011, at 9:25 AM, "Cyril J." <cyril.varghese.jose / gmail.com> wrote:

> Thanks Pat rubular helped a lot.
> I used :
> 
> ([0-9]*[_][0-9]*[_][0-9]*[_])

Equivalent: /(\d*_\d*_\d*_)/

Or even: /((?:\d*_){3})/