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It shows the regex nodes, such as EXACT and NSPACE, as well as any optimizations, such as anchored "Just another ". Second, it tries to match the target string, and shows its progress through the nodes. It’s a lot of information, but it shows me exactly what it’s doing: $ perl -Dr explain-regex 'Just another Perl hacker,' 'Just another (\S+) hacker,' Omitting $` $& $' support. EXECUTING... Compiling REx `Just another (\S+) hacker,' size 15 Got 124 bytes for offset annotations. 2147483647 (checking anchored) minlen 22 Offsets: [15] 1[13] 0[0] 0[0] 0[0] 0[0] 14[1] 0[0] 17[1] 15[2] 18[1] 0[0] 19[8] 0[0] 0[0] 27[0] Guessing start of match, REx "Just another (\S+) hacker," against "Just another Perl hacker,"...

Any little chink in the armor contributes to the overall insecurity. Given enough pieces to put together, someone can eventually get to the point where she can compromise the system. There are other things I can do to prevent this particular problem and I’ll discuss those at the end of this chapter, but in general, when I get input, I want to ensure that it’s what I expect before I do something with it. With careful programming, I won’t have to know about everything open can do. It’s not going to be that much more work than the careless method, and it will be one less thing I have to worry about.

T/ } @ARGV; # determine program name. Usually that's the first thing # after the switches (or the '--' which ends switches). This # won't work if the last switch takes an argument, but handling # that is just a matter of work. my( $double ) = grep { $args[$_] eq '--' } 0 .. $#args; my @single = grep { $args[$_] =~ m/^-/ } 0 .. $#args; Taint Checking | 33 my $program_index = do if( $double elsif( $double elsif( @single }; { and @single ) { 0 } ) { $double + 1 } ) { $single[-1] + 1 } my $program = splice @args, $program_index, 1, undef; unless( -e $program ) { warn qq|Can't open perl program "$program": No such file or directory\n|; exit; } # save the program to another location (current dir probably works) my $modified_program = basename( $program ) .

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