diff --git a/app/models/fluentd/setting/in_tail.rb b/app/models/fluentd/setting/in_tail.rb
index 0a2c53e..e5a009f 100644
--- a/app/models/fluentd/setting/in_tail.rb
+++ b/app/models/fluentd/setting/in_tail.rb
@@ -17,7 +17,7 @@ class Fluentd
           :csv => [:keys, :time_key],
           :ltsv => [:delimiter, :time_key],
           :json => [:time_key],
-          :regexp => [:time_format],
+          :regexp => [:time_format, :regexp],
           # TODO: Grok could generate Regexp including \d, \s, etc. fluentd config parser raise error with them for escape sequence check.
           #       TBD How to handle Grok/Regexp later, just comment out for hide
           # :grok => [:grok_str],