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== Recognizing valid email addresses ==
The lead section mentions recognizing syntactilly valid [[email address]]es as an application for deterministic finite automata. I am not sure if this is supposed to be an in-joke: the syntax and grammar of email addresses at least as defined by the original [[RFC 822]] is quite complex, and using DFAs (at least in the form of regular expressions) is kind of seen as an anti-pattern, at least as far as I understand it. See e.g. the discussion at [[Talk:Email address#Complexity of email addresses]] here on Wikipedia and the top answer to the question "[https://stackoverflow.com/questions/201323/how-to-validate-an-email-address-using-a-regular-expression/63841473#63841473 How to validate an email address using a regular expression?]" on [[Stack Overflow]]. – [[User:Tea2min|Tea2min]] ([[User talk:Tea2min|talk]]) 11:
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