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notes/正则表达式.md
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@@ -153,7 +153,7 @@ abc[^0-9]
**匹配结果**
**abc.def@qq.com**
**abc.def<span>@</span>qq.com**
为了可读性，常常把转义的字符放到字符集合 [ ] 中，但是含义是相同的。