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A password validation regex ensures that a password meets specific security rules such as length, inclusion of uppercase/lowercase letters, numbers, and special characters. This is commonly used in form validations to enforce strong password policies.
Example:
// Regex: 8-15 chars, at least 1 lowercase, 1 uppercase, 1 digit, 1 special charconst regex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@.#$!%*?&])[A-Za-z\d@.#$!%*?&]{8,15}$/;console.log(regex.test("Geeks@123")); // trueconsole.log(regex.test("GeeksforGeeks")); // falseconsole.log(regex.test("Geeks123")); // falseCopied!âś•CopyHow it works:
^ – Start of string
(?=.*[a-z]) – At least one lowercase letter
(?=.*[A-Z]) – At least one uppercase letter
(?=.*\d) – At least one digit
(?=.*[@.#$!%*?&]) – At least one special character from the set
[A-Za-z\d@.#$!%*?&]{8,15} – Only allowed characters, length between 8 and 15
$ – End of string
Alternative with broader rules:
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Yes, and the main reason I pointed this out is that if your regex does NOT match then it may be made vastly more inefficient to determine this if you include unnecessary ".*"s in there!
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