Fix up lua variable writing and reading for regex

processor/regex.go

@@ -57,9 +57,6 @@ func (p *RegexProcessor) ToLua(L *lua.LState, data interface{}) error {
 		// Try to convert to number and set v1, v2, etc.
 		if val, err := strconv.ParseFloat(captures[i], 64); err == nil {
 			L.SetGlobal(fmt.Sprintf("v%d", i), lua.LNumber(val))
-		} else {
-			// For non-numeric values, set v to 0
-			L.SetGlobal(fmt.Sprintf("v%d", i), lua.LNumber(0))
 		}
 	}
 
@@ -80,15 +77,19 @@ func (p *RegexProcessor) FromLua(L *lua.LState) (interface{}, error) {
 		vLuaVal := L.GetGlobal(vVarName)
 		sLuaVal := L.GetGlobal(sVarName)
 
-		// First check string variables (s1, s2, etc.) as they should have priority
+		// If our value is a number then it's very likely we want it to be a number
-		if sLuaVal.Type() != lua.LTNil {
+		// And not a string
+		// If we do want it to be a string we will cast it into a string in lua
+		// wait that wouldn't work... Casting v to a string would not load it here
+		if vLuaVal.Type() == lua.LTNumber {
+			modifications[i] = vLuaVal.String()
+			continue
+		}
+		if sLuaVal.Type() == lua.LTString {
 			modifications[i] = sLuaVal.String()
+			continue
 		}
 
-		// Then check numeric variables (v1, v2, etc.)
-		if vLuaVal.Type() != lua.LTNil {
-			modifications[i] = vLuaVal.String()
-		}
 	}
 
 	return modifications, nil