Fix some go linter warnings

processor/regex.go

@@ -22,9 +22,9 @@ type CaptureGroup struct {
 	Range   [2]int
 }
 
-// ProcessContent applies regex replacement with Lua processing
-// The filename here exists ONLY so we can pass it to the lua environment
-// It's not used for anything else
+// ProcessRegex applies regex replacement with Lua processing.
+// The filename here exists ONLY so we can pass it to the lua environment.
+// It's not used for anything else.
 func ProcessRegex(content string, command utils.ModifyCommand, filename string) ([]utils.ReplaceCommand, error) {
 	processRegexLogger := regexLogger.WithPrefix("ProcessRegex").WithField("commandName", command.Name).WithField("file", filename)
 	processRegexLogger.Debug("Starting regex processing for file")
@@ -216,9 +216,6 @@ func ProcessRegex(content string, command utils.ModifyCommand, filename string)
 		}
 
 		if replacement == "" {
-			// Apply the modifications to the original match
-			replacement = matchContent
-
 			// Count groups that were actually modified
 			modifiedGroupsCount := 0
 			for _, capture := range updatedCaptureGroups {