密码必须包含一个大写字符，一个号码，并在至少8个字符。
Password must contain one upper-case character, one number, and be at least 8 characters.
通常是大写字母、小写字母、特殊字符和数字。
Usually this is upper case, lower case, special character and a number.
例如，大写字母A是unicode字符u + 0065。
For example, the capital letter a is Unicode character U + 0065.
您可以看到，该方法将字符串转换为大写字母。
As you can see that method converted the string to uppercase.
表示大写字母的字符分类名称。
前跟转义字符用于表示任意大写字母的字符。
The character which when preceded by an escape character represents any upper case character.
前跟转义字符用于表示任意大写字母的字符。
The character which when preceded by an escape character represents any upper case character.
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