You're replying to a comment by Seungwon Jeong.

October 24, 2009, 04:45

The pattern "[ -~]" is perfectly valid in ASCII, but it is not valid in many Unicode locales, such as 'en_US.UTF-8'. So, after changing my locale setting using the following shell statements, the pattern works as I expected.

   export LANG=C LC_ALL=C

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