diff --git a/lib/params/base_validator.rb b/lib/params/base_validator.rb
index 9cc4adb3..085f4b45 100644
--- a/lib/params/base_validator.rb
+++ b/lib/params/base_validator.rb
@@ -59,6 +59,14 @@ module Params
       raise_error(message || "#{key} must be a #{type}")
     end
 
+    def format(params, key, regexp, message: nil)
+      return if params.blank?
+      return if params[key].blank?
+      return if regexp.match?(params[key].to_s)
+
+      raise_error(message || "#{key} must follow the #{regexp.source} format")
+    end
+
     def in_path(params, path = [])
       old_path = @current_path
 
diff --git a/lib/params/submission_create_validator.rb b/lib/params/submission_create_validator.rb
index 1a329287..43280db9 100644
--- a/lib/params/submission_create_validator.rb
+++ b/lib/params/submission_create_validator.rb
@@ -60,7 +60,10 @@ module Params
 
         type(submitter_params, :name, String)
         type(submitter_params, :email, String)
+        format(submitter_params, :email, /@/, message: 'email is invalid')
         type(submitter_params, :phone, String)
+        format(submitter_params, :phone, /\A\+\d+\z/,
+               message: 'phone should start with +<country code> and contain only digits')
         type(submitter_params, :values, Hash)
         boolean(submitter_params, :send_email)
         boolean(submitter_params, :send_sms)