Nice (and + +), but the regex can go astray: 
C:>perl -E "my $word="jackhammer"; if ($word =~ /\bjack\b/) {
    say $word;
} else {
    say \"No word-boundry-delimited 'jack's' found in $word\";
}"

No word-boundry-delimited 'jack's' found in jackhammer

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In reply to Re^2: get n lines before or after a pattern by ww
in thread get n lines before or after a pattern by darklord_999

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