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RE: pattern-matching examples

by Anonymous Monk
on Mar 23, 2000 at 01:22 UTC ( #5920=note: print w/ replies, xml ) Need Help??

in reply to pattern-matching examples

It would be really nice if you would have expamples use the /g option at the end of the reg. expr. A lot of people I know avoid using the $_ character and instead like to use a variable assignment with the =~ explicitly. Thanks P.S. Good site otherwise, but your Reg Exp. section could use more expamples.

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RE: RE: pattern-matching examples
by Aighearach on Apr 22, 2000 at 13:53 UTC
    #!/usr/bin/perl -w # # Here is a CGI example of using a regexp to parse a query string, # when you're not sure exactly what will be in the query string # Put it in you web space, and call it with # http://host/script?param_1=this&param_2=that&the_other=doesntmatchth +emask # or call it with ?error=HelloWebMaster if you want to fill the error +log with garbage # use CGI qw( :standard :HTML ); # set slay typos use strict; # read in the CGI params my $object = new CGI(); # print our HTML header print header(),h1( "params: " ); my $key; # set our variable mask. This part gets thrown out. # At, I use more than one pattern, # so that I can determine the number of text areas and style settings +dynamically. # in CGI programming, this is very handy if you are designing a backen +d, # and don't have advanced knowledge of how the front end will call it. my $mask = "param_"; foreach $key ( $object->param() ) { if ( $key =~ /^($mask)(.+)/ ) { #found a parameter, print it out print "<P>param $2=", $object->param( $key ), "</P>"; } elsif ( $key =~ /error/i ) { #found error flag, print error to the appache logs (you ARE us +ing apache, right?!) print STDERR "error: found $key=", $object->param( $ke +y ), " in $0\n"; } }

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