From: Padraig Brady (padraig.brady at domain corvil.com)
Date: Fri 27 Sep 2002 - 15:15:04 IST
Can anyone explain the following
(there should be no output from any of the greps below).
[pixelbeat ~]$ grep --version
grep (GNU grep) 2.5.1
[pixelbeat ~]$ file_ids="1025:243:file1\n243:1025:file2\n243:243:file3\n"
[pixelbeat ~]$ echo -ne $file_ids | grep -E "(0|1|1025|0):(0|1|1025|0)"
[pixelbeat ~]$ echo -ne $file_ids | grep -E "(0|1|2|1025|0):(0|1|2|1025|0)"
1025:243:file1
[pixelbeat ~]$ echo -ne $file_ids | grep -E "(0|1|2|1025|0):(0|1|2|1025|0):"
[pixelbeat ~]$ echo -ne $file_ids | grep -E
"(0|1|2|3|4|5|6|7|8|9|10|65534|1025|48|0):(0|1|2|3|4|5|6|7|8|9|10|65534|1025|48|0)"
1025:243:file1
243:1025:file2
243:243:file3
[pixelbeat ~]$ echo -ne $file_ids | grep -E
"(0|1|2|3|4|5|6|7|8|9|10|65534|1025|48|0):(0|1|2|3|4|5|6|7|8|9|10|65534|1025|48|0):"
243:1025:file2
Padraig.
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