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Re: How to use ']' in the upper bound of a range character set
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From: |
Norihiro Tanaka |
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Subject: |
Re: How to use ']' in the upper bound of a range character set |
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Date: |
Fri, 22 May 2009 00:28:30 +0900 |
Hi,
We can't use and/or escape `]' between `[' and `]' in grep and
egrep. Given cases is interpreted respectively as follows.
- grep -E "[1-\]]" file_input
[1-\] ] CAT
where [1-\] is range cset.
- grep -E "[1-\\]]" file_input
[1-\\] ] CAT
where [1-\\] is cset. it's able to expand as following ...
\([1-\]\|\\\)
- grep -E "[1-]]" file_input
[1-] ] CAT
where [1-] is range cset which is endless.
Re: undocumented \S "joyride" operator, Norihiro Tanaka, 2009/05/15