Comment: ## remove the leading # from a line to uncomment it
Comment: (r*)r # greedy, not possessive, 0 or more
r+the literal r (11410 / 1628 / 7216) (case sensitive), repeated at least once
r the literal text r (case sensitive) Comment: greedy, not possessive, 1 or more
Comment: (r*+)r # greedy, possessive, 1 or more
g modifier: global. Finds all matches instead of stopping after the first
x modifier: extended. Ignores unescaped whitespace and comments outside character classes