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pattern matching

by hnd (Scribe)
on Jun 14, 2009 at 11:08 UTC ( [id://771386]=perlquestion: print w/replies, xml ) Need Help??

hnd has asked for the wisdom of the Perl Monks concerning the following question:

am new (not so new) to perl and am bit confused in m// operator Q1.if we use ? as the delimiter then what does that signify? Q2.we use the . operator with /s to match new lines, can you give me an example?????? Q3.how can we manupilate the tcp packets i.e. how can we change the values of various falgs in the tcp packet

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Re: pattern matching
by moritz (Cardinal) on Jun 14, 2009 at 11:27 UTC
    The answer to your first question can be found in perlop in the section Regexp Quote-Like Operators

    If you use the /s modifier, then . matches any character, including newlines. So for example: 

    "a\nb" =~ m/a.*b/;    # no match
"a\nb" =~ m/a.*b/s;   # matches

    [download]

    For handling TCP packets I'd rather use an existing module from CPAN.

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Re: pattern matching
by irah (Pilgrim) on Jun 15, 2009 at 04:55 UTC

    For handling TCP packets, you can look on, NetPacket::TCP module. Also look on Net::Packet::TCP module.

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