Allow a "not regexp" search of email addresses.

buglist.cgi

@@ -291,6 +291,8 @@ foreach my $id ("1", "2") {
             }
         } elsif ($type eq "regexp") {
             $query .= "\t$lead $table.login_name regexp $qemail\n";
+        } elsif ($type eq "notregexp") {
+            $query .= "\t$lead $table.login_name not regexp $qemail\n";
         } else {
             $query .= "\t$lead instr($table.login_name, $qemail)\n";
         }

query.cgi

@@ -133,6 +133,7 @@ sub GenerateEmailInput {
 <input name="email$id" size="30" value="">&nbsp;matching as
 <SELECT NAME=emailtype$id>
 <OPTION VALUE="regexp">regexp
+<OPTION VALUE="notregexp">not regexp
 <OPTION SELECTED VALUE="substring">substring
 <OPTION VALUE="exact">exact
 </SELECT>