Question

An analyst is filtering web server logs to find requests where the URI path ends with a status code between 500 and 599 (server errors). They write the following grep expression against lines that end with the status code: grep -E ' 5[0-9]{2}$' access.log. Which set of trailing status codes will this regular expression match?

Accepted Answer

Only three-digit codes beginning with 5, such as 500, 503, and 599, appearing at the end of the line

Answer

Any status code containing the digit 5 anywhere, such as 250, 405, and 500

Answer

Only the literal values 5, 0, and 9 anywhere in the line

Answer

Any four-digit code starting with 5, such as 5000 and 5999, at the end of the line