-匹配任何单个字符，这些字符在方括号里面指定，范围是受限的。
- match any single character specified in the brackets, ranges are also permitted.
第一个技巧是使用 *和 ?通配符来分别匹配任何或单个字符 。
The first is to use the * and ? wildcards to match any or a single character, respectively.
任何单个字符或一串字符都可以匹配字符本身，例如上面的“admin”的例子。
Any single character or series of characters can be used to match itself or themselves, as in the "admin" example above.
匹配任何不属于被方括号所包含的字符列表中的单个字符。
Matches any single character not in the list that is enclosed within the square brackets.
匹配任何不属于被方括号所包含的字符列表中的单个字符。
Matches any single character not in the list that is enclosed within the square brackets.
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