$_ = '<title>GRP -134 - Grinding And Cutting Solution (ACME PR50 - Wat
+er Type) </title>';
if (m/\s(?:-\s)?([\w\s\d()\-,]{1,75})<\/title>/) {
    print "$1\n";
}
[download]

prints:

-134 - Grinding And Cutting Solution (ACME PR50 - Water Type)
[download]

Update: Also, the \d is not necessary since you already use \w. You should also consider using one of the CPAN HTML parser modules to grab the contents of the <title> elements.