extracting a number from a stream using sed/grep/awk - awk

Question

i am writting a script and i need to get a number out of the shell command output. The command & its return is
$ git branch -a -v --no-abbrev --contains $(git rev-parse HEAD)
* (HEAD detached at c5246b6) c5246b6907e46795741853852462914e7a5f60de Merge pull request 1166 from testPR into dev
remotes/origin-pull/1166/merge c5246b6907e46795741853852462914e7a5f60de Merge pull request 1166 from testPR into dev
i am trying to extract the 1166 out of the result by using sed over the piped result. Something like
$ git branch -a -v --no-abbrev --contains $(git rev-parse HEAD) | sed <pattern>
to get the 1166
My patterns so far doesn't seem to get the number i am expecting.

Answer 1

I seems that you're trying to extract the part of your remote branch name between last 2 slashes. And you may use grep with perl interpreted pattern to achieve that, here you are,
$ git branch ... | grep -oP '[^\/]+(?=\/[^\/]+$)'
1166
Brief explanation,
-o: Print only the matched (non-empty) parts
[^\/]+ : grep command would print this part, non-slash pattern
(?=\/[^\/]+$) : matches words ahead of the las slash of the line [^\/]+$

Answer 2

Not the answer to my exact question, but i am able to get what i want by modifying my bash command.
git branch -r -v --no-abbrev --contains $(git rev-parse HEAD) | awk '{print $1}'
This returns: origin-pull/1166/merge , which is what i want
notice the -r in the command, -a will return both local and remote git branch info. This way, i can cheat on the sed pattern again.