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snippets/python/s/is-anagram.md

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+---
+title: String is anagram
+type: snippet
+language: python
+tags: [string]
+cover: digital-nomad-8
+dateModified: 2020-11-02T19:28:05+02:00
+---
+
+Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters).
+
+- Use `str.isalnum()` to filter out non-alphanumeric characters, `str.lower()` to transform each character to lowercase.
+- Use `collections.Counter` to count the resulting characters for each string and compare the results.
+
+```py
+from collections import Counter
+
+def is_anagram(s1, s2):
+  return Counter(
+    c.lower() for c in s1 if c.isalnum()
+  ) == Counter(
+    c.lower() for c in s2 if c.isalnum()
+  )
+```
+
+```py
+is_anagram('#anagram', 'Nag a ram!')  # True
+```