Using files to lookup the values, RewriteMap only handles simple string comparisons, which does not cater for my need.

These are my test URLs:

http://myurl.com/aa/index.html
http://myurl.com/aa/bb/index.html
http://myurl.com/aa/foo/index.html
http://myurl.com/cc/index.html
http://myurl.com/cc/dd/index.html
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This is my mapfile:

aa    1
bb    2
cc/dd 3
cc/ee 4
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Consider using the following mapping:

RewriteMap mapping txt:mapfile.txt
RewriteRule ^/(.*)/ - [E=TEST_VAL:$1,E=TEST_RESULT:${mapping:$1},NS]
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Because Apache uses a simple text match, the '/'s (slashes) in the URLs break the mapping. Which led me to use a program.

Apache Config: RewriteMap mapping prg:/my/dir/mapper.pl

mapper.pl:

#!/usr/bin/perl

my $CONFIG_FILE = 'mapfile.txt';

my $config = &get_config;

$| = 1;

while(<STDIN>){
  my $pk = lookup($_);
  print "$pk\n";
}

sub get_config
{
  my $apache_boot_time_message = "$0: Setting up Apache RewriteMap [$C
+ONFIG_FILE]";
  print STDERR "$apache_boot_time_message\n";
  my %config;
  open( CONFIG, '<', $CONFIG_FILE ) or die ("Could not open $CONFIG_FI
+LE: $!");
  while(<CONFIG>){
    chomp;
    my $line = $_;
    my @line = split('\s+', $line);
    $config{$line[0]} = $line[1] unless $line =~ /^#/;
  }
  close CONFIG;
  return \%config;
}

sub lookup
{
  chomp;
  my $DIR   = shift;
  my @parts = split( '/', $DIR );
  for( 0..$#parts ){
    my $dir = join('/', @parts[0..$_]);
    return $config->{$dir} if $config->{$dir};
  }
  return "NULL";
}
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As this script is going to be hit so many times by the webserver, I wondered if anyone had ideas on speeding it up?