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Again, you can use the form below to test this regular expression: Restricting which characters can be used is not good practice as punctuation and other symbols provide extra security.

You might implement this code on your own website as follows: As you can see, it's well worth learning the intricacies of regular expressions.

validating last character regex-81validating last character regex-71

If you're concerned about security you should have some policy on what constitutes a valid password.

If the purpose of registration is to confirm that the person exists, and that they have supplied a valid email address, then as part of the registration processe you a should either email them a random password or a confirmation token rather than letting them choose their own password and use it immediately.

The code presented below would then be used for letting the user change their password.

The form below has three input fields: username, pwd1 and pwd2. If a false value is returned then the form submission is cancelled.

This code will work for browsers as far back as Netscape 4 (circa 1997). If you're not sure how to place this on your page, you might need to read the preceding article on Form Validation, or view the HTML source of this page.