[bug #25765] grep -P regexp also prints the line before the match

[Paolo Bonzini]

Follow-up Comment #1, bug #25765 (project grep):

Reproducible, matches can span multiple lines:

$ echo $'anb' | ./grep -P '^(|.*[^0])b'
a
b
$ echo $'anb' | ./grep -cP '^(|.*[^0])b'
1


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