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     1:31 >perl -wE "my $constant = 'fred'; my $string = 'fredflintstone';
    + print qq[found $1\n] if $string =~ /^$constant/;"
    Use of uninitialized value $1 in concatenation (.) or string at -e lin
    +e 1.
    ...
    found fred
    
     1:32 >