public boolean isValidPropertyValue(@NotNull PsiElement element, @NotNull String propertyName, @NotNull String propertyValue) {
    final RegExpLanguageHost host = findRegExpHost(element);
    return host == null || host.isValidPropertyValue(propertyName, propertyValue);
  }
public boolean isValidPropertyValue(@NotNull PsiElement element, @NotNull String propertyName, @NotNull String propertyValue)