Test, validate and match regular expressions
This regular expression matches lines that consist exactly of the text 'The end', with the start-of-line anchor ^ and end-of-line anchor $ enforcing that no other characters are present. With the 'gm' flags (global and multiline), it checks each line independently in a multi-line string, making it useful for validating or filtering lines that contain the exact phrase. Common use cases include log parsing, configuration file checks, and text preprocessing where only lines with exact content should be selected.