Aaron Stanley King

I couldn't find this exact scenario for javascript regular expression password field valication.

^.*(?=.{6,15})(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).*$

Must be at least 6 - 15 characters

Must contain at least one one lower case letter,
one upper case letter, one digit.

I validated on http://tools.netshiftmedia.com/regexlibrary/ when working on it.