Validating email in javascript using regular expression

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I use it in several PHP programs, and it works most of the time.However, from time to time I get contacted by someone that is having trouble with a site that I have tried the first answer in this page, but this answer accept even 5 or more extensions, so it doesn't meet my third requirement.

validating email in javascript using regular expression-22

Lets try to construct the regular expression that we will be using to check the email entered by the user. Then again any number of alphabets or numbers or ‘-’ are allowed. Finally, the ending of the email ([a-z A-Z]) $ : ^([a-z A-Z0-9])([a-z A-Z0-9\.\_\-])*@(([a-z A-Z0-9]) (\.)) ([a-z A-Z]) $ Now, lets see how to use it in the javascript.For an alternative approach to client-side form validation, without Java Script, check out our new article on HTML5 Form Validation which is available now in most modern browsers.When form input is important, it should always be verified using a secure server-side script.Validating form input with Java Script is easy to do and can save a lot of unnecessary calls to the server as all processing is handled by the web browser.It can prevent people from leaving fields blank, from entering too little or too much or from using invalid characters.

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