Regexp e-mail & társai

Mikor már a regexpel való szívás 3. órájában jártam a mai napon, rábukkantam erre a kis e-mail ellenőrző regular expressionre Viccet félretéve ez az 1982-ben lefektetett RFC 822-es szabvány reguláris kifejezése.. Ami erre illeszkedik, az tutira valid email, domain név, ip cím stb.. Használni már nem olyan egyszerű
Lehet, hogy postolni fogom az e szám első 1000000000 tizedesjegyét.. de még számolom.. addig is jó szórakozást ehez:

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