diff --git a/manifest.jps b/manifest.jps
index 7a36d90..d82a01f 100644
--- a/manifest.jps
+++ b/manifest.jps
@@ -45,7 +45,9 @@
           "name": "app_name",
           "caption": "Application name",
           "required": true,
-          "default": "${env.domain}"
+          "default": "${env.domain}",
+          "regex": "^[\\w-.]*$",
+ 					"regexText": "without special characters"
         },
         {
           "type": "string",
@@ -208,4 +210,4 @@
     ],
     "success": "The installation has been successfully completed. Please, restart your web server instance to apply the changes.</br>After that, you can navigate to your New Relic control panel</a> and explore your app's performance data. <a href='http://newrelic.com/product/' target='_blank'><u>More info</u></a><br>Refer to the <a href='https://docs.newrelic.com/docs/apm/new-relic-apm/troubleshooting'><u>Troubleshooting</u></a> guide in case you face any issues with New Relic APM usage or installation."
   }
-}
\ No newline at end of file
+}