Words in brackets are optional - they are correct, but not necessary.
括号内的词是可选的-他们是正确的，但没有必要的。
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.
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。
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