this Regex Expression can handle ‘-’ character in Ruby email validation
^\w+((-\w+)|(\-)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$
Ruby Regex Expression test tool : http://www.rubular.com/
BTW：only test in ruby.
感谢ashchan 提供了可以支持Gmail 标签的正则表达式，经测试效果也不错，如下：
/^([^@\s!#\$%\^&\(\)]+)@((?:[-a-z0-9A-Z]+\.)+[a-zA-Z]{2,})$/
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Welcome to Raecoo @ Nothing Impossible.I am Raecoo.
Seems not right. Email address can contain ” +”, which is widely used as email alias or filter by Gmail users.
of course,so above expression is right for most Email service