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...
       If the right argument is an expression rather than a
...
       less efficient than an explicit search, because the pat-
       tern must be compiled every time the expression is evalu-
       ated.

    $_ = 'this has a | pipe';
    @a = split /\|/;           # good
    print join(":", @a),"\n"; 
    @a = split "\|";           # oops
    print join(":", @a),"\n";