RegEx For Strong Password

Question

I have the following password requirements:

1) Should be 6-15 characters in length
2) Should have atleast one lowercase character
3) Should have atleast one

Answer 1

Not sure I would use a Regex for that : regex are not always the right tool for any possible kind of job...

Here, you specified a list of 6 requirements ; so, why not just use 6 different tests, one per requirement ?
Those 6 different tests, should I add, would be really simple -- while a Regex would be much harder to write (you asked for help -- you would probably not have for the 6 tests).

This would make your code a lot more easier to understand, I'd bet ;-)
And also : easier to maintain ; and easier to add/remove/change one of the condition corresponding to one of the requirements.