When specified during a search and replace operation, then sections of the character container sequence being searched that do match the regular expression, are not copied to the output string.
指定进行搜索和替换的操作中，字符容器序列中不被匹配的部分，不拷贝到输出字符。
The JSP container looks for character sequences that it recognizes; sequences that indicate there's some syntax that it needs to process.
jsp容器将寻找其能识别的字符序列，此类序列指示其中存在需要进行处理的语法内容。
If there is no space character in the container name after the database partition expression, it is assumed that the rest of the string is part of the expression.
如果容器名称中在数据库分区表达式后面没有空格字符，则认为剩下的字符串是表达式的一部分。
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