diff --git a/12_Day_Regular_expressions/12_day_regular_expressions.md b/12_Day_Regular_expressions/12_day_regular_expressions.md
index 99d85f0..94e132f 100644
--- a/12_Day_Regular_expressions/12_day_regular_expressions.md
+++ b/12_Day_Regular_expressions/12_day_regular_expressions.md
@@ -348,7 +348,7 @@ Zero or many times. The pattern could may not occur or it can occur many times.
 
 ```js
 
-const pattern = /[a].*/g  //. any character, + any character one or more times 
+const pattern = /[a].*/g  //. any character, * any character zero or more times 
 const txt = 'Apple and banana are fruits'
 const matches = txt.match(pattern)
 
@@ -434,91 +434,92 @@ points = ['-1', '2', '-4', '-3', '-1', '0', '4', '8']
 sortedPoints =  [-4, -3, -1, -1, 0, 2, 4, 8]
 distance = 12
 ```
-
 1. Write a pattern which identify if a string is a valid JavaScript variable
 
-    ```sh
-    is_valid_variable('first_name') # True
-    is_valid_variable('first-name') # False
-    is_valid_variable('1first_name') # False
-    is_valid_variable('firstname') # True
-    ```
+```sh
+is_valid_variable('first_name') # True
+is_valid_variable('first-name') # False
+is_valid_variable('1first_name') # False
+is_valid_variable('firstname') # True
+```
 
 ### Exercises: Level 2
 
 1. Write a function called *tenMostFrequentWords* which get the ten most frequent word from a string?
 
-    ```js
-        paragraph = `I love teaching. If you do not love teaching what else can you love. I love Python if you do not love something which can give you all the capabilities to develop an application what else can you love.`
-        console.log(tenMostFrequentWords(paragraph))
-    ```
-
-    ```sh
-        [
-        {word:'love', count:6},
-        {word:'you', count:5},
-        {word:'can', count:3},
-        {word:'what', count:2},
-        {word:'teaching', count:2},
-        {word:'not', count:2},
-        {word:'else', count:2},
-        {word:'do', count:2},
-        {word:'I', count:2},
-        {word:'which', count:1},
-        {word:'to', count:1},
-        {word:'the', count:1},
-        {word:'something', count:1},
-        {word:'if', count:1},
-        {word:'give', count:1},
-        {word:'develop',count:1},
-        {word:'capabilities',count:1},
-        {word:'application', count:1},
-        {word:'an',count:1},
-        {word:'all',count:1},
-        {word:'Python',count:1},
-        {word:'If',count:1}]
-    ```
-
-    ```js
-    console.log(tenMostFrequentWords(paragraph, 10))
-    ```
-
-    ```sh
-   [{word:'love', count:6},
-    {word:'you', count:5},
-    {word:'can', count:3},
-    {word:'what', count:2},
-    {word:'teaching', count:2},
-    {word:'not', count:2},
-    {word:'else', count:2},
-    {word:'do', count:2},
-    {word:'I', count:2},
-    {word:'which', count:1}
-    ]
-    ```
+```js
+paragraph = `I love teaching. If you do not love teaching what else can you love. I love Python if you do not love something which can give you all the capabilities to develop an application what else can you love.`
+console.log(tenMostFrequentWords(paragraph))
+```
+
+```sh
+[
+{word:'love', count:6},
+{word:'you', count:5},
+{word:'can', count:3},
+{word:'what', count:2},
+{word:'teaching', count:2},
+{word:'not', count:2},
+{word:'else', count:2},
+{word:'do', count:2},
+{word:'I', count:2},
+{word:'which', count:1},
+{word:'to', count:1},
+{word:'the', count:1},
+{word:'something', count:1},
+{word:'if', count:1},
+{word:'give', count:1},
+{word:'develop',count:1},
+{word:'capabilities',count:1},
+{word:'application', count:1},
+{word:'an',count:1},
+{word:'all',count:1},
+{word:'Python',count:1},
+{word:'If',count:1}]
+```
+
+```js
+console.log(tenMostFrequentWords(paragraph, 10))
+```
+
+```sh
+[
+{word:'love', count:6},
+{word:'you', count:5},
+{word:'can', count:3},
+{word:'what', count:2},
+{word:'teaching', count:2},
+{word:'not', count:2},
+{word:'else', count:2},
+{word:'do', count:2},
+{word:'I', count:2},
+{word:'which', count:1}
+]
+```
 
 ### Exercises: Level 3
 
-1. Writ a function which cleans text. Clean the following text. After cleaning, count three most frequent words in the string.
+1. Write a function which cleans text. Clean the following text. After cleaning, count three most frequent words in the string.
   
-  ```js
-    sentence = `%I $am@% a %tea@cher%, &and& I lo%#ve %tea@ching%;. There $is nothing; &as& mo@re rewarding as educa@ting &and& @emp%o@wering peo@ple. ;I found tea@ching m%o@re interesting tha@n any other %jo@bs. %Do@es thi%s mo@tivate yo@u to be a tea@cher!?`
+```js
+sentence = `%I $am@% a %tea@cher%, &and& I lo%#ve %tea@ching%;. There $is nothing; &as& mo@re rewarding as educa@ting &and& @emp%o@wering peo@ple. ;I found tea@ching m%o@re interesting tha@n any other %jo@bs. %Do@es thi%s mo@tivate yo@u to be a tea@cher!?`
 
-   console.log(cleanText(sentence))
-   ```
+console.log(cleanText(sentence))
+```
 
-   ```sh
-    I am a teacher and I love teaching There is nothing as more rewarding as educating and empowering people I found teaching more interesting than any other jobs Does this motivate you to be a teacher
-    ```
+```sh
+I am a teacher and I love teaching There is nothing as more rewarding as educating and empowering people I found teaching more interesting than any other jobs Does this motivate you to be a teacher
+```
 1. Write a function which find the most frequent words. After cleaning, count three most frequent words in the string.
 
-    ```js
-    console.log(mostFrequentWords(cleanedText))
-    [{word:'I', count:3}, {word:'teaching', count:2}, {word:'teacher', count:2}]
-    ```
+```js
+console.log(mostFrequentWords(cleanedText))
+```
 
+```sh
+[{word:'I', count:3}, {word:'teaching', count:2}, {word:'teacher', count:2}]
+```
 
 🎉 CONGRATULATIONS ! 🎉
 
-
-[<< Day 11](../11_Day_Destructuring_and_spreading/11_day_destructuring_and_spreading.md) | [Day 13>>](../13_Day_Console_object_methods/13_day_console_object_methods.md)
+[<< Day 11](../11_Day_Destructuring_and_spreading/11_day_destructuring_and_spreading.md) | [Day 13>>](../13_Day_Console_object_methods/13_day_console_object_methods.md)
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