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Aug 1, 2020
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Update data-wrangling.md #32

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2 changes: 1 addition & 1 deletion _2020/data-wrangling.md
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Expand Up @@ -100,7 +100,7 @@ perl -pe 's/.*?Disconnected from //'
```bash
| sed -E 's/.*Disconnected from (invalid |authenticating )?user .* [^ ]+ port [0-9]+( \[preauth\])?$//'
```
让我们借助正则表达式在线调试工具[regex debugger](https://regex101.com/r/qqbZqh/2) 来理解这段表达式。OK，开始的部分和以前是一样的，随后，我们匹配两种类型的“user”（在日志中基于两种前缀区分）。再然后我们匹配属于用户名的所有字符。接着，再匹配任意一个单词（`[^ ]+` 会匹配任意非空切不包含空格的序列）。紧接着后面匹配单“port”和它后面的一串数字，以及可能存在的后缀`[preauth]`，最后再匹配行尾。
让我们借助正则表达式在线调试工具[regex debugger](https://regex101.com/r/qqbZqh/2) 来理解这段表达式。OK，开始的部分和以前是一样的，随后，我们匹配两种类型的“user”（在日志中基于两种前缀区分）。再然后我们匹配属于用户名的所有字符。接着，再匹配任意一个单词（`[^ ]+` 会匹配任意非空且不包含空格的序列）。紧接着后面匹配单“port”和它后面的一串数字，以及可能存在的后缀`[preauth]`，最后再匹配行尾。


注意，这样做的话，即使用户名是“Disconnected from”，对匹配结果也不会有任何影响，您知道这是为什么吗？
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