Why are people using regexp for email and other complex validation?

Question

There are a number of email regexp questions popping up here, and I\'m honestly baffled why people are using these insanely obtuse matching expressions rather than a very si

Answer 1

Regexps are much faster to use, of course, and they only validate what's specified in the RFC. Write a custom parser? What? It takes 10 seconds to use a regexp.