I am looking for something like this...
Given this file (lets call it "foo.log"):
START_OF_ENTRY
line2
END_OF_ENTRY
START_OF_ENTRY
no match
END_OF_ENTRY
START_OF_ENTRY
line2
END_OF_ENTRY
Executing the following command:
pcregrep -M -o '(?m)^START_OF_ENTRY\nline2\nEND_OF_ENTRY$' foo.log | for match in STDIN; do echo "match: $match"; done
would produce
match: START_OF_ENTRY
line2
END_OF_ENTRY
match: START_OF_ENTRY
line2
END_OF_ENTRY
Is this possible in bash?
Using bash regular expression matching with the proviso that there does not appear to be a multiline equivalent of the ^ and $ anchors in bash:
x=$(<foo.log)
printf -v re 'START_OF_ENTRY\nline2\nEND_OF_ENTRY'
while [[ $x =~ $re ]]; do
printf 'match: %s\n' "${BASH_REMATCH[0]}"; x=${x#*${BASH_REMATCH[0]}};
done
match: START_OF_ENTRY
line2
END_OF_ENTRY
match: START_OF_ENTRY
line2
END_OF_ENTRY
With Perl, in which you can use the m modifier to make ^ and $ meaningful in a multiline context:
perl -0777 -nE 'while ($_ =~ /^(START_OF_ENTRY\nline2\nEND_OF_ENTRY)$/mg) {say "match: $1"}' foo.log
