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snippets/python/s/snake.md

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+---
+title: Snakecase string
+type: snippet
+language: python
+tags: [string,regexp]
+cover: organizer
+dateModified: 2020-11-02T19:28:35+02:00
+---
+
+Converts a string to snake case.
+
+- Use `re.sub()` to match all words in the string, `str.lower()` to lowercase them.
+- Use `re.sub()` to replace any `-` characters with spaces.
+- Finally, use `str.join()` to combine all words using `-` as the separator.
+
+```py
+from re import sub
+
+def snake(s):
+  return '_'.join(
+    sub('([A-Z][a-z]+)', r' \1',
+    sub('([A-Z]+)', r' \1',
+    s.replace('-', ' '))).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_small_things'
+```