Regular expression for validating numbers in javascript

: Finally, the email address must end with two to four alphabets.

Having a-z and A-Z means that both lowercase and uppercase letters are allowed.

This chapter describes Java Script regular expressions.

The simplest way to do this is to have the password entered twice, and then check that they are identical.

If the regular expression remains constant, using this can improve performance.

Or calling the constructor function of the Using the constructor function provides runtime compilation of the regular expression.

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.


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