Regex Tester & Validator

This regular expression uses a negative lookahead to match any entire line or string that does not end with the file extensions .jpg, .png, .js, or .css. The global and multiline flags allow it to process multiple lines simultaneously, while the case-insensitive flag ensures it catches variations like .JPG or .PNG. It is commonly used in web development to filter out static assets like images, stylesheets, and scripts from file path lists.