Hostname:the literal text Hostname: (case sensitive) \s+any whitespace character, repeated at least once
Group Hostname(?<Hostname>[^\n]*) Negated Character Class[^\n]* *matches any number of characters outside the set below:
\na line-feed (newline) character (ASCII 10)
\s+any whitespace character, repeated at least once
Site name:the literal text Site name: (case sensitive) \s+any whitespace character, repeated at least once
Group SiteName(?<SiteName>[^\n]*) Negated Character Class[^\n]* *matches any number of characters outside the set below:
\na line-feed (newline) character (ASCII 10)
g modifier: global. Finds all matches instead of stopping after the first
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string
s modifier: single line. Allows a dot to match line terminators