Regular Expressions (preg_match)

[stevenmw]

If you can define how something starts using preg_match, can you define what character(s) something ends with.

For example, the following would have to start with an upper-case letter.

/^[A-Z][a-zA-Z]$/ 

If I'm building a random password generator can I use the same syntax as above to define the characters in the password?

[gvre]

You can match the end of string using $. Check this tutorial for more details.
The random password generator should choose characters from one or more predefined strings (e.g. "abcdef" "ABCDEF" "1234567890" "abcdefABCDEF1234567890") according to your passwords policy rules (num of lower, num of caps, num of numbers, etc).