Case-insensitive regex match
Return pets whose pet_name starts with a vowel, regardless of capitalization. Use a regex with `.str.contains(...)`: prefix the pattern with `(?i)` for case-insensitive matching, and `^[aeiou]` to anchor at the start.
Return pets whose pet_name starts with a vowel, regardless of capitalization. Use a regex with `.str.contains(...)`: prefix the pattern with `(?i)` for case-insensitive matching, and `^[aeiou]` to anchor at the start.