Simplify EvalRegex function by removing unnecessary panic handling and nil checks

processor/processor.go

@@ -487,17 +487,8 @@ func EvalRegex(L *lua.LState) int {
 	evalRegexLogger := processorLogger.WithPrefix("evalRegex")
 	evalRegexLogger.Debug("Lua evalRegex function called")
 
-	defer func() {
-		if r := recover(); r != nil {
-			evalRegexLogger.Error("Panic in EvalRegex: %v", r)
-			// Push empty table on panic
-			emptyTable := L.NewTable()
-			L.Push(emptyTable)
-		}
-	}()
-
-	pattern := L.ToString(1)
-	input := L.ToString(2)
+	input := L.ToString(1)
+	pattern := L.ToString(2)
 
 	evalRegexLogger.Debug("Pattern: %q, Input: %q", pattern, input)
 
@@ -506,13 +497,17 @@ func EvalRegex(L *lua.LState) int {
 
 	evalRegexLogger.Debug("Go regex matches: %v (count: %d)", matches, len(matches))
 
+	if len(matches) > 0 {
 		matchesTable := L.NewTable()
 		for i, match := range matches {
 			matchesTable.RawSetInt(i, lua.LString(match))
 			evalRegexLogger.Debug("Set table[%d] = %q", i, match)
 		}
-
 		L.Push(matchesTable)
+	} else {
+		L.Push(lua.LNil)
+	}
+
 	evalRegexLogger.Debug("Pushed matches table to Lua stack")
 
 	return 1