Empty password (reset bar and text), very long password (cap the score), common password detection (check against a list), and updating the criteria checklist in real-time (strikethrough passed rules). Consider entropy-based scoring for more accuracy.
Check the password against rules (length >= 8, uppercase, lowercase, number, special char) using regex. Count the passed rules as a score. Display a colored bar (red to green) and a criteria checklist. Update in real-time on input.
Check rules with regex: length >= 8, /[A-Z]/ for uppercase, /[a-z]/ for lowercase, /[0-9]/ for numbers, /[^A-Za-z0-9]/ for special chars. Count the passed rules. Map the score to levels (very weak, weak, medium, strong, very strong).
/[A-Z]/ for uppercase, /[a-z]/ for lowercase, /[0-9]/ for numbers, /[^A-Za-z0-9]/ for special characters. Also check password.length >= 8 for minimum length.
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