Regex Tester & Validator

This regular expression is designed to match XML or HTML opening tags that contain a specific attribute named "id". It operates by finding an opening angle bracket, skipping any characters until a whitespace-separated "id" string is encountered (ensuring it's a whole word using \b), and then completing the match at the closing angle bracket. It is particularly useful for parsing DOM structures, extracting elements with unique identifiers, or validating markup snippets.