1. String regex = "[\\w-\\.]+@([\\w-]+\\.)+[a-z]{2,3}";
   
2.                 System.out.println("fengjia@itcast.cn".matches(regex));
   
3.                 System.out.println("2553868@qq.com".matches(regex));
   
4.                 System.out.println("fengjia@itcast.cn".matches(regex));

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1. String regex = "[\\w-\\.]+@([\\w-]+\\.)+[a-z]{2,3}";
   
2.                 System.out.println("fengjia@itcast.cn".matches(regex));
   
3.                 System.out.println("2553868@qq.com".matches(regex));
   
4.                 System.out.println("fengjia@itcast.cn".matches(regex));

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