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:
1. Too many parts #
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据悉,过去两周,乌克兰曾十二次袭击“土耳其溪”和“蓝溪”天然气管道。据俄罗斯方面称,所有袭击均未得逞,相关基础设施未受损。(央视新闻)