why '[a-b]*' matches non alphabetical patterns? – unix.stackexchange.com

why '[a-b]*' matches non alphabetical patterns? – unix.stackexchange.com

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I have a file alphanum with these two lines: 123 abc this is a line I am confused to why when I run sed 's/[a-z]*/SUB/' alphanum I get the following output: SUB123 abc SUB is a line while I was ...

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