Validate user-submitted username string for qualifying length and character constraints...

What does it mean when a regular expression is delimited by @ symbols?...

Validate that a submitted password contains the required minimum strength...

Password strength validating regex error: No ending delimiter or unknown modifier...

React by each character input...

Deem password invalid if it contains N number of consecutive ascending alphanumeric characters...

Password Checking/ Strengthening Password...

all() function is Python - Works for digits, not for uppercase?...