... String to Integer (atoi)(溢出检测) Regular Expression Matching(递归) Integer to Roman(整数转罗马数，静态表) ...
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Note that this is not regular expression matching as used by grep.
注意：这不是grep使用的正则表达式匹配。
Its capability is very simple and does not even include regular expression matching.
这个功能非常简单，甚至不包含正则表达式匹配。
Luckily, you have the sed command (Stream EDitor), which provides powerful regular expression matching and replacement.
幸运的是，您可以使用sed命令(Stream EDitor)，它提供了功能强大的正则表达式匹配和替换。
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