On Saturday 24 November 2007 22:59, Todd wrote: > See the codes below. The trick here is that $& is an special var used > to capture the total match string. > So in this case, the /[$&]/ regexp literal is equal to / > [.type=xmlrpc&]/.
Right. And that is a character class which says to match *one* character, either '.' or '=' or '&' or 'c' or 'e' or 'l' or 'm' or 'p' or 'r' or 't' or 'x' or 'y'. > #!/bin/perl > $url = 'http://abc.com/test.cgi?TEST=1&.type=xmlrpc&type=2'; > ($r1) = $url =~ /\.type=(.+?)(&|$)/; > print "\$&=$&\n"; > ($r2) = $url =~ /\.type=(.+?)[$&]/; > > print "\$r1=$r1\n\$r2=$r2\n" > > __DATA__ > $&=.type=xmlrpc& > $r1=xmlrpc > $r2=x Which is why $r2=x because (.+?) matches the 'x' after '.type=' and [.type=xmlrpc&] matches the 'm' after '.type=x'. Also, using $& (or $` or $') slows down all regular expressions in the program. John -- use Perl; program fulfillment -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
