The following sample uses a text file to store rules that are applied to a second text file. The database details you can probably sort out for yourself - the technique maps easily.

use strict;
use warnings;

# First generate a sample data file
open (outFile, '>', "delme.txt") or die "Can't create test file: $!";
print outFile <<DATA;
Server: win1  ID: D: Space: 6496911360
Server: ux22  ID: D: Space: 7973826560
Server: del2  ID: U: Space: 7973228544
Server: del3  ID: U: Space: 3973228544
DATA
close outFile;

# Now a file of match patterns
open (outFile, '>', "delme.regex") or die "Can't create test file: $!"
+;
print outFile <<DATA;
Space:(\b3\\d+)
ServerD:Server: (?i:d)
ID:ID: (\\w+)
DATA
close outFile;

#Now the solution code
my %matchPatterns;
my $matchType = shift;

#Build the pattern table
open inFile, '<', "delme.regex";
while (<inFile>) {
  chomp;
  $matchPatterns{$1} = $2 if /(\w+):(.*)/;
}
close inFile;

if (! defined $matchType) {
  print "Match type must be one of:\n", join ' ', sort keys %matchPatt
+erns;
  exit -1;
}

#Scan the text file
open inFile, '<', 'delme.txt';
while (<inFile>) {
  chomp;
  print "$_\n" if /$matchPatterns{$matchType}/;
}
close inFile;
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With ServerD passed on the command line prints:

Server: del2  ID: U: Space: 7973228544
Server: del3  ID: U: Space: 3973228544
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