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  1. or download this
    >perl -wMstrict -le
    "my $str = 'abcd';
    ...
    (?-xism:(?=[^a-z])) does not match 'abcd'
    (?-xism:(?![a-z])) matches 'abcd' at offset(s) 4
    (?-xism:\b) matches 'abcd' at offset(s) 0 4