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Lots of ambiguity here, don't know if extensions are allowed to have numbers, or if extensions can be of length 0, or if username can be length 0. Makes the task more about "guess the regex that validates our definition of what a valid email addresses is" than using filter
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Validating Email Addresses With a Filter
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Lots of ambiguity here, don't know if extensions are allowed to have numbers, or if extensions can be of length 0, or if username can be length 0. Makes the task more about "guess the regex that validates our definition of what a valid email addresses is" than using filter