fix: handle non-ASCII characters in extract_alphanumeric

Author: yyossy5

src/basic/string.py

@@ -20,12 +20,12 @@ def reverse_string(text: str) -> str:
     return text[::-1]
 
 
-def extract_alphanumeric(text: str) -> str:
+def extract_alphanumeric(s: str) -> str:
     """
     Extracts only alphanumeric characters from the given string
 
     Args:
-        text (str): The input string
+        s (str): The input string
 
     Returns:
         str: String containing only alphanumeric characters
@@ -35,5 +35,9 @@ def extract_alphanumeric(text: str) -> str:
         'HelloWorld123'
         >>> extract_alphanumeric("@#$% abc 123")
         'abc123'
+        >>> extract_alphanumeric("こんにちは123ABCワールド")
+        '123ABC'
     """
-    return "".join(char for char in text if char.isalnum())
+    # isascii() ensures we only get ASCII characters (0-127),
+    # excluding Unicode characters like Japanese, Emoji, etc.
+    return "".join(c for c in s if c.isascii() and c.isalnum())