|Don't ask to ask, just ask|
It's not only Perl but the emphasis is on Perl.
Mastering Regular Expressions - Jeffrey E. F. Friedl
ISBN 10: 1-56592-257-3 | ISBN 13: 9781565922570
Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination are omnipotent. The slogan "press on" has solved and always will solve the problems of the human race.
-- Calvin Coolidge, 30th President of the USA.