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Perl: the Markov chain saw

Re^4: regex trouble

by blackgoat (Acolyte)
on Mar 05, 2010 at 10:32 UTC ( #826937=note: print w/replies, xml ) Need Help??

in reply to Re^3: regex trouble
in thread regex trouble

I have to run a command in unix. And I have to match this expression from whatever output I get. I tried doing the following:

my $var = 'command'; my ($exp) = $var =~ m/(v\d{2}\.\d{2})-([a-z]\d{3})/;

The same is followed by a html script in which the value of $exp must appear. But I am unable to do so...

Can u pls help!



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Re^5: regex trouble
by amir_e_a (Hermit) on Mar 05, 2010 at 11:03 UTC

    You probably want to do something like

    my $var = `command`;

    Notice that the single quotes were replaces by backticks. There are certain problems with using backticks, but it's usually OK to use them to run a simple and safe command.

    Also, your current code will only capture v09.11. If you want to capture v09.11-e020, use this:

    my ($exp) = $var =~ m/(v\d{2}\.\d{2}-[a-z]\d{3})/;

      I'm getting the following error:

      Unmatched ( in regex; marked by <-- HERE in m/( <-- HERE v\d{2}\.\d{2}(a-z\d{3})/

        You probably only need one opening bracket in the beginning and one closing in the end:


        Brackets should usually match - for every opening bracket there must be one closing bracket.

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