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        Debugging regular expressions
    
           There are two ways to enable debugging output for regular
    ...
           scoped).
    
           [snip; read the details in the perldebug documentation.]
    
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    #!perl -c
    use re 'debug';
    
    ...
    /(?:a|b|c|d|e|f|gt)t/;
    
    __END__
    
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    /at/||/bt/||/ct/||/dt/||/et/||/ft/||/ght/;
    
    compiling RE `at'
    ...
      25: END(0)
    minlen 2