Build, test, and debug regular expressions
This regular expression validates a full string to ensure it contains only alphabetic characters, including both standard English letters and common accented characters used in various European languages. It also allows spaces, hyphens, apostrophes, commas, and periods to accommodate complex names (e.g., "O'Connor", "Mary-Jane", "St. John"). Using the case-insensitive flag, it is perfectly suited for validating first names, last names, or full names in international applications.