Regex pattern for strong password php

strong_pass_regex.txt

^\S*(?=\S{8,})(?=\S*[a-z])(?=\S*[A-Z])(?=\S*[\d])\S*$
From the fine folks over at Zorched.

^: anchored to beginning of string
\S*: any set of characters
(?=\S{8,}): of at least length 8
(?=\S*[a-z]): containing at least one lowercase letter
(?=\S*[A-Z]): and at least one uppercase letter
(?=\S*[\d]): and at least one number
$: anchored to the end of the string
To include special characters, just add (?=\S*[\W]), which is non-word characters.

Source: https://stackoverflow.com/a/8141210/6887746