Nmap Development: Perl-style regular expression

["zf81811" <zf81811 () 126 com>]

hello,everyone
What is  Perl-style regular expression ?    Perl-style regular expression  is the  pattern  of the file 
nmap-service-probes ,used to determine whether the response received matches the service given in the previous 
parameter . for example,  m/^.\0\0\0\n(4\.[-.\w]+)\0...\0/.
but I don't understand?  i can not to parse it.
thanks,good luck!


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