Regexes: document :overlap and :exhaustive

lib/Language/regexes.pod

@@ -826,7 +826,30 @@ the start of the string, but C<:c> overrides that.
 
 =head3 Exhaustive
 
-TODO
+To find all possible matches of a regex, including overlapping ones, and
+several ones that start at the same position, supply the C<:exhaustive> (short
+C<:ex>) adverb.
+
+    given 'abracadabra' {
+        for m:exhaustive/ a .* a / -> $match {
+            say ' ' x $match.from, ~$match;
+        }
+    }
+
+Produces this output:
+
+=begin code
+abracadabra
+abracada
+abraca
+abra
+   acadabra
+   acada
+   aca
+     adabra
+     ada
+       abra
+=end code
 
 =head3 X<Global|regex adverb,:global;regex adverb,:g>
 
@@ -855,7 +878,19 @@ C<:p> is a shortcut for C<:pos>.
 
 =head3 Overlap
 
-TODO
+To get several matches, including overlapping matches, but only one (the
+longest) from each starting position, specify the C<:overlap> (short C<:ov>)
+adverb:
+
+    given 'abracadabra' {
+        for m:overlap/ a .* a / -> $match {
+            say ' ' x $match.from, ~$match;
+        }
+    }
+
+produces
+
+=begin code
 
 =head1 Best Practices and Gotchas