linux - print matching word after a pattern using grep -

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grep '[branch "default"]' -a 3 config | grep -po 'merge = \k\w+'

this grep command prints "master" want, there way single grep command instead of 2 grep's ? or other solution?

file config has:

.... .... [branch "default"]          remote = origin          merge = master .... ....

with gnu grep:

grep -zop '\[branch "default"\].*\n.*\n.*merge = \k\w+' filename

or gnu sed:

sed -n '/\[branch "default"\]/{n;n;s/.*merge = \(\w\+\).*/\1/p}' filename

output:

 master

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