代码中一些常见的小片段

1,检验邮件格式是否正确

public final static String REG_email = "^[\\w\\d]+@[\\w\\d]+(\\.[\\w\\d]+)+$";

Pattern pattern = Pattern.compile(RegExpression.REG_email);

Matcher m = pattern.matcher(email);

if (!m.find()) {

　　System.out.println("Wrong email format.");

}