Validating email in javascript using regular expression

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Actually there are a number of additional possibilities and additional limitations, but this is a good start describing an e-mail address.I am not really sure if there are length limitation on either of the username or the domain name.He loves to help people improve their way of programming. He likes to write automated tests and refactor code. Shortened to reg Exp or reg Ex this pattern can be used (among other things) to match content of strings.In various use-cases, but especially at web-based registration forms we need to make sure the value we received is a valid e-mail address.The regular expression pattern is interpreted as follows.method does not verify that the top-level domain name is a valid domain name listed at the IANA Root Zone Database, which would require a look-up operation.

Before we try to answer that question, let me point out that there are already, ready-made and high-quality solutions for these problems.Email:: Address can be used to extract a list of e-mail addresses from a given string.For example: examples/email_It properly verifies if an e-mail is valid, it even removes unnecessary white-spaces from both ends of the e-mail address, but it cannot really verify if the given e-mail address is really the address of someone, and if that someone is the same person who typed it in, in a registration form.Because we will want to make sure the given string matches exactly our regex, we start with an anchor matching the beginning of the string We can use all lower-case characters as the e-mail addresses are case sensitive.We just have to make sure that when we try to validate an e-mail address first we'll convert the string to lower-case letters.

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