Problem with Bash regex test case sensitivity

[Lee Rothstein]

Having some problems with bash case-sensitive regexes, so I wrote
this little test.

t_regex
--------
#!/bin/bash

# t_regex: Test test regex

# By Lee Rothstein, 2010-12-03, 16:27:38

if [[ "$1" =~ [A-Z] ]] ; then
     echo Contains Capital Letters: $1
else
     echo Doesn\'t Contain Capital Letters: $1
fi
--
# Good
$ t_regex 890
Doesn't Contain Capital Letters: 890

# Good
$ t_regex DFGH
Contains Capital Letters: DFGH

# Good
$ t_regex Dfgh
Contains Capital Letters: Dfgh


# WTF, O
$ t_regex dfgh
Contains Capital Letters: dfgh
--

Do I have some Bash or Cygwin parameter set that engenders case
insensitivity? Or, is this a bug? Or, am I being overly sensitive?
;-)

Note:
--
$ echo $CYGWIN
tty title nodosfilewarning glob:noignorecase winsymlinks ntsec
--

And, oh yes, I tested this on Linux, and it works fine.

Thanks,

cygcheck output is attached

Lee

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