Regular expression for validating email in javascript

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Java script can check the regular expression pattern for valid email address.We have different regular expression patterns for validating email address.On the final line we call test method for our regular expression and pass the email address as input.If the input email address satisfies our regular expression, ‘test’ will return true otherwise it will return false. You can call this method whenever you want to validate email address.Unless you are validating for a specific domain where the email naming policy is more structured.BTW, please don't validate email addresses on the client-side.: 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.

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(which is particularly important for mobile applications which may be contacting a server via slow Wifi or mobile networks)[email protected] Gallagher, you're right about performance.To get a valid email id we use a regular expression /^\w ([\.-]? ~ characters are legal in the local part of an e-mail address but in the above regular expression those characters are filtered out. It begins with at least one or more word characters including the underscore, equivalent to [A-Za-z0-9_]. Pragmatically you can only assume it contains one @ and that there is at least one .following the @ somewhere but thats about it really if you want to avoid alienating at least some of your users.

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