timeoutthe literal text timeout (case sensitive) \sany whitespace character
http-requestthe literal text http-request (case sensitive) \s+any whitespace character, repeated at least once
\d+a digit, repeated at least once
Positive Lookahead(?=\s+defaults) \s+any whitespace character, repeated at least once
defaultsthe literal text defaults (case sensitive) m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string