Regex special sequences added

README.md

@@ -173,10 +173,10 @@ re.split(<regex>, text, maxsplit=0)  # Use brackets in regex to keep the matches
 **Use r'\1' for backreference.**
 
 #### Special Sequences
-```
-\d  == [0-9]          # Digit
-\s  == [ \t\n\r\f\v]  # Whitespace
-\w  == [a-zA-Z0-9_]   # Alphanumeric
+```python
+'\d' == [0-9]          # Digit
+'\s' == [ \t\n\r\f\v]  # Whitespace
+'\w' == [a-zA-Z0-9_]   # Alphanumeric
 ```
 **Use capital letter for negation**