regex - Matching zero or more characters in sed -

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i practicing commands using sed when confused output of following command:

echo 'first:second' | sed 's_[^:]*_(&)_g'

my question is: why command wrap string "first" , "second" in parentheses?

shouldn't colon wrapped since specified "zero or more non-colons" in regex condition?

please clarify.

you use 

[^:]

which searches characters except :. experience normal comportment.


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