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Re^2: Matching consecutive "different" regex patterns across multiple lines

by duelafn (Vicar)
on Apr 23, 2011 at 13:04 UTC ( #900968=note: print w/replies, xml ) Need Help??

in reply to Re: Matching consecutive "different" regex patterns across multiple lines
in thread Matching consecutive "different" regex patterns across multiple lines

More explicitly, Anonymonk is suggesting processing the input line-by-line using something like the following rather than attempting to match a whole chunk at once. Here I am just keeping the john line. If you actually need the lines between, push them to a @buffer as Anonymonk suggests.

my $john; while (defined(local $_ = <DATA>)) { if (/^(john\d+)$/) { $john = $1; } elsif (/^(jacob \- \d\.0)$/) { if ($john) { print "$john - $1\n"; } else { die "Jacob is not preceded by John!"; } undef $john; } } __DATA__ bhgfsggdsgsg -- john1 weruwearnwrnweuarar jjafdaiuweifweofiuwe jacob - 1.0 -- nfaslf23523525 john2 asfsjldf43tgre john3 asbdfhskafbv3333v sdfahh34ttg sadfhk34t3wtg sdfhk3gfwghhw3 jacob - 2.0

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