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A comment on The “Chad” bug. Parent comment

Re:The “Chad” bug by kevin_thibedeau on Thursday December 31, 2015 @11:56AM (#10818405)
Where do you draw the line? I occasionally have valid GMail addresses with "+" in them rejected because someone wrote a crappy validator.
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Re:The “Chad” bug by Dylan16807 on Thursday December 31, 2015 @05:33PM (#10820089)
Allow all the characters that are supposed to be valid outside of quotation marks. Letters, numbers, .!#$%&'*+-/=?^_`{|}~

That way if you don't mind letting through double periods or domain segments having more than 63 characters, you can validate an email with two character classes separated by an @. The basic regex looks like [xx]+@[yy]+

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