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snippets/python/s/slugify.md

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+---
+title: String to slug
+type: snippet
+language: python
+tags: [string,regexp]
+cover: sliced-fruits
+dateModified: 2020-10-25T12:43:20+02:00
+---
+
+Converts a string to a URL-friendly slug.
+
+- Use `str.lower()` and `str.strip()` to normalize the input string.
+- Use `re.sub()` to to replace spaces, dashes and underscores with `-` and remove special characters.
+
+```py
+import re
+
+def slugify(s):
+  s = s.lower().strip()
+  s = re.sub(r'[^\w\s-]', '', s)
+  s = re.sub(r'[\s_-]+', '-', s)
+  s = re.sub(r'^-+|-+$', '', s)
+  return s
+```
+
+```py
+slugify('Hello World!') # 'hello-world'
+```