例句與用法

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1. Determines whether a character is in a character class
   確定字符是否在字符類中。
2. The important point , though , is to realize that essentially
   以下是可用字符類的相當(dāng)完整的列表：
3. Note that white space is never eliminated from within a character class
   ）請注意，空白永遠(yuǎn)不會從字符類中消除。
4. Category represents " symbol , math "
   字符類說明
5. Matches any character in the unicode general category or named block specified by
   指定的命名字符類中的任何字符都匹配。