添加一个Cheat Sheet

si9ma · web-flow · commit 3181f0540361 · 2019-03-12T02:40:43.000+08:00
diff --git a/notes/正则表达式.md b/notes/正则表达式.md
@@ -51,6 +51,9 @@
 | {n,m}   | 重复n到m次                | yo{1, 3} | yo,yooo    | yoooo    |
 | {n,}    | 重复至少n次               | yo{2,}   | yoo, yooo  | yo       |
 
+# Cheat Sheet
+
+[![building...](https://si9ma.github.io/cool-cheatsheet/img/regexr.png)](https://si9ma.github.io/cool-cheatsheet/pdf/regexr.pdf)
 
 # 正则在线验证
 
