^start of line
\?{3}the literal ? (6310 / 778 / 3F16) , repeated exactly 3 times
\h+any horizontal whitespace character, repeated at least once
ad-questionthe literal text ad-question (case sensitive) \h+any horizontal whitespace character, repeated at least once
.+any character (except for line terminators), repeated at least once
\n+a line-feed (newline) character (ASCII 10), repeated at least once
Non-Capturing Group(?:.*\n?)+? +?repeats the group contents below at least once:
.*any character (except for line terminators), repeated any number of times
\n?optionally matches a line-feed (newline) character (ASCII 10)
\n+a line-feed (newline) character (ASCII 10), repeated at least once
^start of line
\h+any horizontal whitespace character, repeated at least once
admonitionthe literal text admonition (case sensitive) $end of line
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