On 05/04/2016 03:29 PM, Markus Schönhaber wrote:
Samuel Sieb, Wed, 4 May 2016 10:42:20 -0700:
On 05/04/2016 10:09 AM, Jon LaBadie wrote:
The '*' means "zero or more digits". Don't forget that zero.
The first match is where there are zero digits, i.e. at the
beginning of the line. So sed replaces it with "//" (nothing).
However, usually regexps are greedy so they match as much as possible,
not the minimum.
And that's what it does. It matches the empty string at the beginning of
the line - and it would also (greedily) match digits at the beginning of
the line, but there are none. Try
echo '123This is a test 12335 and 669384 535xy4' | sed 's/[0-9]*//'
Oh, right. I never use a regexp that can match nothing, so I missed
that. :-)
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