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Re^3: Regex and writing lines in file

by BillKSmith (Curate)
on May 01, 2013 at 18:45 UTC ( #1031630=note: print w/ replies, xml ) Need Help??

in reply to Re^2: Regex and writing lines in file
in thread Regex and writing lines in file

The following code uses an array as a "circular list" to delay the printing of the EXTRA. Is this what you need?

use strict; use warnings; my $match = qr /Match/; my $extra = qq(EXTRA\nEXTRA\n); my @extras = (q()) x 3; my $in = 3; my $out = 0; while (my $line = <DATA>) { $out = ($out+1) % 4; print $line, $extras[$out]; $in = ($in +1) % 4; $extras[$in] = ($line =~ /$match/)? $extra : q(); } __DATA__ a b Match1 Match2 c d e f g Match3 h i j k

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