36 lines (32 with data), 865 Bytes
#!/usr/bin/perl
############################################################################
# misc/concat-lines
#
# Part of the STXXL. See http://stxxl.sourceforge.net
#
# Copyright (C) 2007 Johannes Singler <singler@ira.uka.de>
# Copyright (C) 2010 Andreas Beckmann <beckmann@cs.uni-frankfurt.de>
#
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
############################################################################
# Concatenate the lines of file $ARGV[0] which both satisfy regular expression $ARGV[1]
$regex = $ARGV[0];
shift;
$former = '';
while($line = <>)
{
if(!($line =~ /$regex/) || !($former =~ /$regex/))
{
print("\n");
}
else
{
print("\t");
}
chomp($line);
print($line);
$former = $line;
}
print("\n");