diff --git a/docs/12-day.md b/docs/12-day.md
index 30443ab..b172a42 100644
--- a/docs/12-day.md
+++ b/docs/12-day.md
@@ -333,7 +333,7 @@ We can specify the length of the substring we look for in a text, using a curly
 
 ```js
 const txt = 'This regular expression example was made in December 6,  2019.'
-const pattern = /\\b\w{4}\b/g  //  exactly four character words
+const pattern = /\b\w{4}\b/g  //  exactly four character words
 const matches = txt.match(pattern)
 console.log(matches)  //['This', 'made', '2019']
 ```
@@ -488,4 +488,4 @@ I am a teacher and I love teaching There is nothing as more rewarding as educati
     [{word:'I', count:3}, {word:'teaching', count:2}, {word:'teacher', count:2}]
   ```
 
-🎉 CONGRATULATIONS ! 🎉
\ No newline at end of file
+🎉 CONGRATULATIONS ! 🎉