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  1. or download this
    c:\@Work\Perl\monks>perl -wMstrict -le
    "use Data::Dump qw(pp);
    ...
    regex 1: (?^msx: f [eio]+ e ): match, $1 is 'fiiiie'
    string 1: pure string: NO match
    regex 2: (?^:pure string): NO match