Scan Multiple Dir/Files


 
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# 8  
Old 03-30-2008
Well, for example, anything with four digits with dots between them will also catch Microsoft Exchange version numbers, so you need to put in a bit of context. There's a myriad different Received: header formats out there but maybe you are only looking for your own, in which case it's trivial to pinpoint which field in there is the IP address.

Actually, looking at the code again, the conditions before you even attempt a regex are pretty specific, so I guess you're fine.

Anyway, for a tool like this, maybe it's better to have a few false positives than to miss out on something important.
 
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regex(3)						     Library Functions Manual							  regex(3)

Name
       re_comp, re_exec - regular expression handler

Syntax
       char *re_comp(s)
       char *s;

       re_exec(s)
       char *s;

Description
       The  subroutine	compiles  a string into an internal form suitable for pattern matching.  The subroutine checks the argument string against
       the last string passed to

       The subroutine returns 0 if the string s was compiled successfully; otherwise a string containing an  error  message  is  returned.  If	is
       passed 0 or a null string, it returns without changing the currently compiled regular expression.

       The  subroutine returns 1 if the string s matches the last compiled regular expression, 0 if the string s failed to match the last compiled
       regular expression, and -1 if the compiled regular expression was invalid (indicating an internal error).

       The strings passed to both and may have trailing or embedded newline characters; they are terminated by	nulls.	 The  regular  expressions
       recognized are described in the manual entry for given the above difference.

Diagnostics
       The subroutine returns -1 for an internal error.

       The subroutine returns one of the following strings if an error occurs:

       No previous regular expression
       Regular expression too long
       unmatched (
       missing ]
       too many () pairs
       unmatched )

See Also
       ed(1), ex(1), egrep(1), fgrep(1), grep(1)

																	  regex(3)