Well, I finally picked up a sed/awk book and now I don't have to post to
the list on how to do the basic stuff... -- so now I've got a more legit
question with grouping. It seems not to be working for me.. the book I
have says that using () only works with (usually) egrep and awk. I'm not
getting error messages, but, it isn't working either.
I want to search for an ip address by using the string:
[0-9]\{3\}(\.[0-9]\{1,3\})\{3\}
(3 numbers, then 3 sets of a dot followed by 1 to 3 numbers).
If I run:
echo "asdfas .asd 216.123.34.123 asdfas asdf"|sed
's/.*\([0-9]\{3\}(\.[0-9]\{1,3\})\{3\}\).*$/\1/'
I just get the original line back. If I search just with the basic
string, it doesn't match:
echo "asdfas .asd 216.123.34.123 asdfas asdf"|sed -n
'/([0-9]\{3\}(\.[0-9]\{1,3\})\{3\}/p
outputs nothing.
I think the problem is with the grouping of the the runs of .### since:
echo "asdfas .asd 216.23.123.43 asdf asd|sed
's/.*\([0-9]\{3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\).*$/\1/'
works prefectly, but is a little long in syntax.
Thanks,
Ben
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