How to use [strings.matches]

The reference page of strings.matches has its arguments, constraints and declaration.

Returns all regular expression matches from specified source string.

.input:Foo Bar Howdy World {match1} and {match2} and that was it
strings.matches:x:-
   .:"\\{.+?\\}"

The above will result in the following.

strings.matches
   .:{match1}
   .:{match2}