Regex Editor & Tester

This Python regex extracts all text occurring between the exact phrases 'This is' and 'sentence'. It uses the `(?s)` flag (DOTALL) to ensure the `.*?` pattern matches any characters, including newlines. By utilizing positive lookbehind and lookahead assertions, it matches only the middle content without including the boundary strings in the final result. This is highly useful for scraping data, parsing logs, or extracting specific substrings from larger documents.