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grep option "-i" does not work for me with backreference
From: |
Clifford Ekholm OOK |
Subject: |
grep option "-i" does not work for me with backreference |
Date: |
Sun, 29 Oct 2000 01:18:11 +0300 (EEST) |
Hi
"grep --version" gave
grep (GNU grep) 2.4.2
Trying to learn a bit about regular expressions and tried the following to
find doubled words in a textfile that looked like this:
Line 0: ...... Hello there.
Line 1: ... hupa hupa ...
Line 2: ... Hupa Hupa ...
Line 3: ... Hupa hupa ...
Line 4: a b cd efg
With "egrep -i '\<([a-z]+) +\1\>'" I only cought line 1
with "egrep -i '(\<[a-zA-Z]+) +\1\>'" I caught line 1 and 2
with "egrep -i huPa" I caught all 3 lines which shows the option "-i" does
something; "egrep huPa" did not catch any line.
I would have thought I could have caught " Hupa hupa " even with the first
try.
Best regards
Clifford
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Clifford Ekholm <- WWW: http://noon.abo.fi/~cliffa/
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#!/usr/bin/perl
print +(split(//,'Just another Polack,'))[0..13,10..11,15,4,9,16..18,10,11,19];
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