The Extracted Fields section allows users to extract specific data or information from message fields value using regular expressions. This is useful for isolating and analyzing particular data points such as IP addresses, timestamps, request types, and URLs.

## Fields and Options

- Selected Expression: This displays the part of the log entry that has been successfully extracted based on the regular expression provided.
- Regular Expression: The regular expression used to match and extract specific parts of the log entry. Regular expressions are powerful tools for pattern matching within text.
- Source Type: It shows the type of source from which the data is being extracted. This can help in identifying the format and structure of the logs or text data.
- Field Name: User can specify a name for the extracted field.
- Preview Button: When the user clicks the preview button, it will display the related/matched data. This helps verify if the correct data has been extracted.
- Save Button: The user can save the current regular expression and field name for future use.