\( \) is used to remember the pattern so that you can recall it later
"+" means one or more matched pattern
"?" means one or zero matched pattern
So you probably can't replace + with ?
Just want to know whether my understandin of the below expression is correct.
grep -o "0034\([0-9]\)\+" => This will fetch all numbers starting with 0034
grep -o "0034[0-9]\+" => This will fetch anything that follows 0034. Say for example: 003483744 0034abcd
But the first one picks only 0034, followed by numbers. Am I Right?
Did you test on your system, what did those commands return ?
In my test (with debian 5) it should be :
And this command should be translated to : find all numbers starting with 12
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