^start of line
?repeats the group contents below at most once:
\s*any whitespace character, repeated any number of times
Non-Capturing Group(?:\s*Connection\s+)? ?repeats the group contents below at most once:
\s*any whitespace character, repeated any number of times
Connectionthe literal text Connection (case sensitive) \s+any whitespace character, repeated at least once
.+?any character (except for line terminators), repeated at least once
\s*any whitespace character, repeated any number of times
=the literal = (6110 / 758 / 3D16)
\s*any whitespace character, repeated any number of times
newthe literal text new (case sensitive) \s+any whitespace character, repeated at least once
DBConnectionthe literal text DBConnection (case sensitive) 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