From 56f3c13d17b6e98923bc914cc51ed95527ea0b55 Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Fri, 6 Jan 2017 13:07:22 +0100
Subject: mod_register: Strip '+' char from field names without using length

---
 plugins/mod_register.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/mod_register.lua b/plugins/mod_register.lua
index f89efe20..7a57d65b 100644
--- a/plugins/mod_register.lua
+++ b/plugins/mod_register.lua
@@ -64,7 +64,7 @@ for _, field in ipairs(additional_fields) do
 		registration_form[#registration_form + 1] = field;
 	else
 		if field:match("%+$") then
-			field = field:sub(1, #field - 1);
+			field = field:sub(1, -2);
 			field_map[field].required = true;
 		end
 
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