Specify how to retrieve log entries from the error log. You can retrieve all log entries, a specified number of log entries last accessed, all log entries from a specified time period, or all log entries matching a regular expression. The predefined regular expressions provided by the dialog are generally sufficient for filtering. They contain the most commonly accessed keywords in the error log such as Error, deadlock, warning, and so on.
However, to define your own custom regular expression, click add, and specify a descriptive name and the regular expression clause.
For example, to view lines of the log that refer to configuration, specify "All lines with configuration" for Name and "configuration" for Regular Expression.