Can anybody explain me that mail format code what is happening in that code?

JavaScript
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var mailformat = /^\w+([.-]?\w+)@\w+([.-]?\w+)(.\w{2,3})+$/;

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Go to link.You can insert your regex and analyze at portions what exactly means each of them

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Be aware that this RegExp will mark a lot of valid email addresses as invalid (e.g. on .info domains)

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An excellent visual explanation of what is happening in that regex is to be found at

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