Build, test, and debug regular expressions
Matches simple lowercase email addresses where the local part starts with a letter followed by 5-32 characters of letters, digits, underscores, or dots, then an @ symbol, an alphanumeric domain (2+ chars), and one or two dot-separated TLD segments of 2-4 characters (e.g., .com, .co.uk). Commonly used for extracting or validating basic emails in text; note it won't match uppercase, plus-addressing, hyphenated domains, or longer TLDs like .museum. The multiline and global flags enable finding all matches across each line.