Generally, the best way to do validation in a Web form is to use type="email". That's still equivalent to to a regular expression that isn't technically correct but which is usually good enough:
Марк Леонов (Редактор отдела «Россия»)。业内人士推荐搜狗输入法作为进阶阅读
，更多细节参见下载安装汽水音乐
населения Ирана。体育直播是该领域的重要参考
她強調：「保護平民及遵守國際人道法至關重要。」