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bugs in gawk metacharacters
From: |
Daniel Gryte |
Subject: |
bugs in gawk metacharacters |
Date: |
Mon, 27 Sep 2004 18:00:26 -0400 |
I am using RedHat 9.0, GNU bash ver2.05.8 and GNU awk 3.1.0
Suppose the file lab3.data has the following lines:
Mike Harrington:(510)548-1278:250:100:175
Guy Quigley:(916)343-6410:250:100:175
Chet Main:(510)548-5258:50:95:135
Elizabeth Stachelin:(916)440-1763:175:75:300
The bugs concern the metacharacter syntax for character replication,
specifically the following:
r{m} should pick up the character r repeated exactly m times
r{m,} should pick up the character r repeated at least m times
r{m,n} should pick up the character r repeated between m and n times
inclusive
None of these these items work.
For example, to extract the lines whose first names have EXACTLY 4
characters the following should work:
awk '/^[A-Z][a-z]{3}/{print $1}' lab3.data
or
awk '/^[A-Za-z]{4}/{print $1}' lab3.data
Note that + works fine and . but that all of the character-replications
with curly braces {} fail.
Sincerely,
Daniel Gryte
John Abbott College Computer Science Dept.
Ste Anne de Bellevue, Quebec
- bugs in gawk metacharacters,
Daniel Gryte <=