In the Field Extractor Utility, what does the 'non-matches' button do?

In the Field Extractor Utility, the 'non-matches' button is designed to show events that do not have any extracted fields associated with them. This functionality allows users to identify and analyze data points that may not conform to the expected patterns or criteria defined for extraction. By highlighting these events, users can troubleshoot or adjust their extraction regex patterns and improve the overall quality of their field extractions. The focus on events without extracted fields can also aid in ensuring that important information isn't overlooked during the extraction process, offering an opportunity to refine how data is parsed for better results in subsequent searches and analyses.

The other choices, while relevant to different aspects of the utility, do not accurately describe the specific purpose of the 'non-matches' button. For instance, displaying matched fields and removing non-matching events pertain to different functions within the utility, and validation of field extractions implies a level of checking that goes beyond what the non-matches feature provides.