Given an unsorted list of URLs (ie from a DBI query) and a target URL to match ... I need to find the longest Matching URL in the unsorted list ... and the portion of the Target URL that isn't matched.

For example if the list contains:
http://www.someplace.com/foo
http://www.someplace.com/foo/bar
http://www.someplace.else.com/foo

and the target is:
http://www.someplace.com/foo/fighter/index.html

it should return:
http://www.someplace.com/foo, fighter/index.html

I have the following code (generalized for this post): 

sub getMapping = {
my $uri_in = shift;
   $uri_in =~ m!.*://([^/]*)!;
my $domain = $1;
my $dbh = getDBH();
my $path = '';
my $query  = qq{
    SELECT ftpID, uri, path  # first get all records that
    FROM tURIMapping  # refer to the domain
    WHERE uri REGEXP '.*$domain.*';
};
my $sth = $dbh->prepare($query);
   $sth->execute;     

my $aMapping = undef; # now let's search for the best match
my $i = '0';
while ($aMapping = $sth->fetchrow_arrayref()){ 
# while there are still mappings
  my $target = $uri_in; # set the target
  while ($i < 5) {
    last if $aMapping->[1] eq $target;  # exit if this is the mapping
    $target =~ s!(^\w+://.*)/(.*)$!$1!i;  # remove the last part of th
+e uri
    $path = '/'.$2.$path if $2;  # save the last part as the path
    last if $target =~ m!^\w+://[^/]/?$!i;  # exit if this just a doma
+in
    $i++;
  } # end while ($i)
  last if $aMapping->[1] eq $target;  # double check this is the targe
+t
} # end while ($aMapping = $sth->fetchrow_arrayref())
die "No Mapping Found for $uri_in" unless $aMapping;
my ($ftpID, $uri, $map_path) = @$aMapping;  # if the ftpID is null
my $type = $ftpID? 'ftpAccount':'filesystem'; # this is a filesystem
$sth->finish;                    
$dbh->disconnect;
return ($type, $map_path.$path, $ftpID); 
};

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The code did come at a point where I was just beginning to write perl after a long haitus so I apologize for the "unique" style. This code has been one of the buggiest least robust parts of the entire project. So I am here asking if this is the best way? Is there a better Algorithm/Solution? Is the code just riddled with bugs?

In reply to Longest Matching URL by marceus

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