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字符集中使用运算符 .
添加 \ 和不添加表现一致
字符集中使用运算符 `.` 添加 \ 和不添加表现一致
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<pre>
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"ar[.]" => A garage is a good place to park a c<a href="#learn-regex"><strong>ar.</strong></a>
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"ar[\.]" => A garage is a good place to park a c<a href="#learn-regex"><strong>ar.</strong></a>
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"ar[\.]" => A garage is a good place to park a c<a href="#learn-regex"><strong>ar\.</strong></a>
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</pre>
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[在线练习](https://regex101.com/r/wL3xtE/1)
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