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Regular Expressions in JavaScript

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Validating a Password

3:53 with Joel Kraft

Learn how to validate a password that requires at least one lowercase letter, one uppercase letter and one number.

Password Regular Expression

Here's the regular expression we end up with in the video. It uses a "lookahead".

/^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).*$/

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    replacing any typed character with a bullet symbol. 0:00
    This hides the password from anyone spying over your shoulder. 0:02
    To see what we're doing though, I'm going to change this to a simple text input so 0:07
    we can see what we type into the field. 0:12
    Now we'll be able to test it and make sure our validation works. 0:23
    And when we have it working, we can just change it back to a password type. 0:26

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