fixed special character regex

src/passwordler/password_strength.py

@@ -17,7 +17,7 @@ def password_strength(password):
     """
     count_uppercase = len(re.findall("[A-Z]", password))
     count_numbers = len(re.findall('[0-9]', password))
-    count_special_chars = len(re.findall('[!-\/:-@[-`{-~]', password)) 
+    count_special_chars = len(re.findall('[!-/:-@\\[-`{-~]', password)) 
     length = len(password)
     common_passwords = ['123456', 'password', '12345', '12345678', 'qwerty', '1234567890', '1234', 
                         'baseball', 'dragon', 'football', '1234567', 'monkey', 'letmein', 'abc123',