Build, test, and debug regular expressions
Matches flight schedule entries for Sydney, such as 'Sydney 0830, 10:15AM – Terminal', where a 4-digit flight number is followed by a comma, whitespace, and a time. The 6-7 character time (e.g., '8:30AM' or '11:45PM') is captured into a named group 'TimeOB' for easy extraction. Flexible separators ([\r\s\W]{0,3}) handle varying formatting like dashes or extra spaces. Useful for parsing airport departure/arrival boards or travel itineraries with global, multiline searching.