[bug #27919] possible glitch with -i and character class

[Matt McCutchen-8]

URL:
  <http://savannah.gnu.org/bugs/?27919>

                 Summary: possible glitch with -i and character class
                 Project: grep
            Submitted by: None
            Submitted on: Tue 03 Nov 2009 04:45:17 AM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

    _______________________________________________________

Details:

There seems to be some sort of glitch with character classes and the -i
(--ignore-case) switch.

I am using Mac OS X 10.6.1 (Snow Leopard).

grep --version shows v2.5.1.

I have not checked the latest grep version.  Hopefully you can do that
without too much trouble.

To reproduce--

Create a text file called "test.txt" that consists of a single line of text
with the two letters T and K followed by a unix line feed, as shown below
(also see the attached file):

TK

(I did not attempt to reduce the test case further or see if the particular
choice of letters matters.)

The case-insensitive search "grep -i [A-Z]K test.txt" finds no matches while
the same search done case-sensitively (i.e. without the -i switch) does find a
match.  See below for a console session that shows a couple other related
searches that work.

$ grep [A-Z]K test.txt
TK
$ grep [T]K test.txt
TK
$ grep -i [T]K test.txt
TK
$ grep -i [^A-Z]K test.txt
TK
$ grep -i [A-Z]K test.txt
$

I have also e-mailed this information to the bug-gnu-utils address.

Thanks,
--Chris




    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Tue 03 Nov 2009 04:45:17 AM UTC  Name: test.txt  Size: 3B   By: None
Test case (one line file with letters T and K)
<http://savannah.gnu.org/bugs/download.php?file_id=18981>

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[Matt McCutchen-8]

Follow-up Comment #1, bug #27919 (project grep):

Sorry for the report, I see now that this was already known and fixed.

My report seems to be the same as that reported in Bug 16567:

https://savannah.gnu.org/bugs/?16567

I also see the following known bug note in the README for v2.5.4:

"The option -i does not work properly in some multibyte locales such as
tr_TR.UTF-8 where the upper case and lower case forms of a character are not
necessarily of the same byte length."

I was able to verify that the issue I reported is not present in version
(v2.5.4) as obtained through MacPorts ( http://www.macports.org/ ).

Thanks and sorry again!


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