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sudo cast
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sudo cast
$ locale --all-locales | grep --ignore-case --regexp='en_GB.UTF-\?8'
en_GB.utf8

$ locale --all-locales | grep --ignore-case --regexp='en_GB.UTF-?8'

$ locale --all-locales | grep --extended-regexp --ignore-case --regexp='en_GB.UTF-?8'
en_GB.utf8

In GNU grep there is no difference in available functionality between basic and extended syntaxes.

为什么？？

#grep #regex
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