diff --git a/day3/day3.lua b/day3/day3.lua
index 779ec5b..e7cd512 100644
--- a/day3/day3.lua
+++ b/day3/day3.lua
@@ -7,7 +7,7 @@ function find_duplicates(first, second)
     for i = 1, #first do
         local char = string.sub(first, i, i)
 
-        if string.match(second, char) then
+        if string.find(second, char) then
             if char == string.upper(char) then
                 return string.byte(char) - string.byte("A") + 27
             elseif char == string.lower(char) then
diff --git a/day3/day3part2.lua b/day3/day3part2.lua
index af7c405..a3c6601 100644
--- a/day3/day3part2.lua
+++ b/day3/day3part2.lua
@@ -11,7 +11,7 @@ end
 function find_duplicates(one, two, three)
     for i = 1, #one do
         local char = string.sub(one, i, i)
-        if string.match(two, char) and string.match(three, char) then
+        if string.find(two, char) and string.find(three, char) then
             if char == string.upper(char) then
                 return string.byte(char) - string.byte("A") + 27
             elseif char == string.lower(char) then