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what does this match for?

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From:
practicalperl
Date:
February 11, 2009 19:46
Subject:
what does this match for?
Message ID:
fbe35f750902111946q3f66c738x87e6beb27361303@mail.gmail.com
I saw a Regex:

(?i:(j?sessionid|(php)?sessid|(asp|jserv|jw)?session[-_]?(id)?|cf(id|token)|sid))


I especially didn't know what the leading "?i:" means.
Please help, thanks!

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