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.
Remember that, as Java Script isn't available in all browsers, you should also use server-side scripting to validate all data before recording it in a database or elsewhere.
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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.
The real weakness is in not using an acceptable password hashing function at all. Using scrypt requires root access and the ability to install PHP extensions via PECL.
Several things are wrong with this approach It requires storing passwords in plain text - This is the worst thing one can do to a user's password anyone who accidentally gains access to your database would instantly be in possession of all your users' passwords, with is very, very bad.… continue reading »