allow setting fuzzy matching pattern after mod load

init.lua

@@ -655,6 +655,29 @@ end
 waypoint_compass={}
 
 
+function waypoint_compass.get_coords_pattern()
+    return FUZZY_COORD_PATTERN
+end
+
+
+-- Allow changing coords pattern after mod is loaded
+function waypoint_compass.set_coords_pattern(pattern)
+    if type(pattern) == "string" then
+        -- This is an attempt at "validating" the pattern. Whatever
+        -- lua is doing, it's not enough to just pass non-empty string
+        -- to trigger a invalid pattern error, or even some random
+        -- string.  Hope is that running pattern against itself will
+        -- trigger whatever is wrong with it.
+        local status, err = pcall(string.find, pattern, pattern)
+        if status then
+            FUZZY_COORD_PATTERN = pattern
+            return pattern
+        end
+        return status, err
+    end
+end
+
+
 -- Basic function that can be overridable with something smarter
 function waypoint_compass.teleport(player, pos)
     if player and type(player) == "userdata" and minetest.is_player(player) then