Build, test, and debug regular expressions
This regex matches HTML line break tags (`<br>`) in various formats including self-closing versions with optional spaces and slashes. It catches different capitalizations (br, BR, Br, bR). Note: The character classes `[b|B]` and `[r|R]` unintentionally match pipe characters since `|` is literal inside brackets, not alternation. Useful for bulk replacing br tags in HTML content.