grep problem?

[Jim Garrison]

I'm getting weird behavior from grep. Searching for a bracketed range of characters (i.e. [A-Z]) is doing case-insensitive matching, while an identical but explicit character set match (i.e. [ABCDE...Z]) does not.  Examples below.  Output of "cygcheck -s -v -r"  attached.

LANG=en_US
GREP_OPTIONS is unset

$ cat > test.dat
abcde
ABCDE

$ grep '[A-Z]' test.dat
abcde
ABCDE

$ grep '[A-E]' test.dat
abcde
ABCDE

$ grep '[a-z]' test.dat
abcde
ABCDE

$ grep '[a-e]' test.dat
abcde
ABCDE

$ grep '[a-b]' test.dat
abcde
ABCDE

Contrast with the correctly-working examples below

$ grep '[ab]' test.dat
abcde

$ grep 'A' test.dat
ABCDE

$ grep a test.dat
abcde

$ grep '[A]' test.dat
ABCDE

$ grep '[ABC]' test.dat
ABCDE

$ grep '[ABCDE]' test.dat
ABCDE

$ grep '[ABCDEFGHIJKLMNOPQRSTUVWXYZ]' test.dat
ABCDE


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