After all it's only the browser display being obfuscated and not the data transfer.Because the input type obscures the text typed, you should let the user confirm that they haven't made a mistake.

validating with regular expressions-31

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

Some common restrictions are: Leaving the last requirement for now, as it requires a server-side script, let's see what's possible using just client-side HTML and Java Script.

Here are some simple steps to make the process more secure.

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.

In some circles these replacement keys ($1, $2 etc.) are known as “backreferences”.

A lot of websites now require registration, meaning that users need to be assigned a username and password.

All product ID’s start with either the letter ‘M’ or ‘D’ followed by 4 or 5 digits and then an additional trailing letter to signify upgrades and variations.

Validating such an input would be perfectly possible without using a single regular expression, as shown here: Hopefully the above example has demonstrated the necessity and importance of regular expressions in Java Script (if you weren’t already convinced).

The available flags include: I couldn’t come up with a good name; “string extraction” seems suitable, although it sounds a bit dodgy if not in the context of programming.