Validating user input with c

Consider the following: If you are using a supported browser you can use the form below to test the regular expression: If you want to restrict the password to ONLY letters and numbers (no spaces or other characters) then only a slight change is required.

If you're concerned about security you should have some policy on what constitutes a valid password.A lot of websites now require registration, meaning that users need to be assigned a username and password.Here are some simple steps to make the process more secure.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.

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All we have changed from the previous example is to add some extra attributes to the form input fields.

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