FDLife validator

◦ Email verification: Use regular expressions to check the basic format
◦ Password verification: Check the length, character diversity and calculate the strength
◦ Phone number verification: Simply verify the length of the number
◦ URL verification: Use regular expressions to check the basic URL format

◦ Credit card verification: Verification is conducted using the Luhn algorithm
◦ Custom regular expressions: Allow users to input their own regular expressions