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Лс
~
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grep -Po "([a-z,A-Z,0-9]{2}:){5}[a-z,A-Z,0-9]{2}"
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echo 00:11:22:33:44:55 | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}'
M
M
echo 00:11:22:33:44:55 | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}'
~
Лс
M
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Лс
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Лс