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Here's a version that only keeps one line in memory at a time (as opposed to every match). It is done elegantly (from the perspective of the function's user) using an iterator.

use strict; use warnings; use File::Glob qw( bsd_glob ); sub search_files { my ($re, @files) = @_; my $fh; my $file_name; return sub { START: if (not defined $file_name) { return () if not @files; $file_name = shift(@files); if (!open($fh, '<', $file_name)) { warn("Unable to open file \"$file_name\": $!\n"); undef $file_name; goto START; } } while (defined(my $line = <$fh>)) { if ($line =~ /$re/) { return ( $file_name, $., $line ); } } undef $fh; undef $file_name; goto START; }; } { my @files = bsd_glob('*'); my $re = qr/^source*/; my $iter = search_files($re, @files); while (my ($file_name, $line_num, $line) = $iter->()) { print("$file_name,$line_num: $line"); } }

In reply to Re^2: search for a pattern in file without opening the file (iter) by ikegami
in thread search for a pattern in file without opening the file by Anonymous Monk

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