day after I undertand a littlee more all these xml hell files (not friendly to read ;)),

Use a text editor that does syntax highlighting. :)
 

but to be a PERl developer since 1999 understand regex and PERL language make life more easy...

Hint: don't say PERL, say Perl or perl instead. People who say PERL are considered uneducated.
 

mmhmm,  I said PERL as you say SIP, ti's an acronysm....