In its simplest form, regular expressions can match exact sequences of characters.
在其最简单的形式中，正则表达式可以匹配精确的字符序列。
The exact sequences are the basic means on studying the functors of module theory.
正合列是模论中研究函子问题的基本工具。
Exact search finds ordered sequences of words.
精确搜索找到排序的单词系列。
And sometimes you need to be able to specify exact inputs or sequences of inputs.
而且有时，你需要能指明准确的输入和输入序列。
And sometimes you need to be able to specify exact inputs or sequences of inputs.
而且有时，你需要能指明准确的输入和输入序列。
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