The code I used to create and use that regex (Commented) is

#!/usr/bin/perl -w

my %form = (
        'searchprice' =>  "15001-9999999",
       );
my @Tests = ('$1600', ' $1,300 ', ' $1,600,000.43 ', ' $1600. ', ' $16
+00.43 ');

foreach my $desc (@Tests) {
    print "Testing $desc\n";
    my ($LowValue, $HighValue) = split("-", $form{'searchprice'});  #s
+plits two values to compare desc to
    if ($desc =~ m/  \$     #Matches the dollar sign
                 (      #Begins gathering the digit grouping
                      \d{1,3},?  #Grabs between 1 and 3 digits.  
                                 #There must be at least one and at mo
+st 
                                 #3 before the first comma.
                      [\d{3},?]* #This grabs groups of 3 digits, 
                                 #and the comma after them if it exist
+s
                      \.?\d{0,2} #This grabs the final decimal point a
+nd 
                                 #up to two places after it if they ex
+ist
                     )#Ends the digit grouping
                 /x  #tells it to ignore whitespace
        ) {
    my ($Price) = $1;  #sets $Price equal to the match in the regex
    $Price =~ s/,//g;  #Strips out commas
    print "TestPrice $Price\n";
    if (($LowValue <= $Price) && ($Price <= $HighValue)) {
        print "$desc\n";
    }
    } else {
    print "No price found in $desc\n";
    }
    print "\n";
}
[download]

The regex itself isn't quite as clean as it could be, but it works on the assumption that there is one and only one properly formatted price in each $desc.

Dave