Fix snake snippet

snippets/snake.md

@@ -11,15 +11,13 @@ Break the string into words and combine them adding `_-_` as a separator, using
 import re
 
 def snake(str):
-  return re.sub(r"(\s|_|-)+","-",
-    re.sub(r"[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+",
-    lambda mo: mo.group(0).lower(),str)
-  )
+    return '-'.join(re.sub('([A-Z][a-z]+)', r' \1',
+                      re.sub('([A-Z]+)', r' \1', str)).split()).lower()
 ```
 
 ```py
-snake('camelCase'); # 'camel_case'
-snake('some text'); # 'some_text'
-snake('some-mixed_string With spaces_underscores-and-hyphens'); # 'some_mixed_string_with_spaces_underscores_and_hyphens'
-snake('AllThe-small Things'); # "all_the_smal_things"
+snake('camelCase'); # 'camel-case'
+snake('some text'); # 'some-text'
+snake('some-mixed_string With spaces_underscores-and-hyphens'); # 'some-mixed-string-with-spaces-underscores-and-hyphens'
+snake('AllThe-small Things'); # "all-the-smal-things"
 ```