diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -5,4 +5,4 @@
 
 `d20` 表示投出`1`颗`20`面骰子。
 
-匹配的正则表达式如下`(\d*)[dD](\d+)`
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+匹配的正则表达式如下`\b(\d*)[dD](\d+)\b`
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