Build, test, and debug regular expressions
Extracts volume or chapter identifiers from Novel Updates RSS feed titles by capturing the last occurrence of 'v' or 'c' followed by a digit (e.g., 'v2' or 'c150') through the end of the string. The greedy leading .* ensures the rightmost match wins, handling titles like 'Novel Name - Volume 1 Chapter 50' or 'Series c250 - Group'. Useful for parsing chapter numbers from novel aggregator feeds.