package service import "fmt" func validateString(value string, fieldName string) error { if value == "" { return fmt.Errorf("field \"%s\" needs to be set: %w", fieldName, ErrBadRequest) } else if !safeInputRegex.MatchString(value) { return fmt.Errorf("use only letters, dashes and spaces for \"%s\": %w", fieldName, ErrBadRequest) } else { return nil } }