regexp(n) on macOS
The text ca612636e18e, as Mac OS X 10.1.5, Mac OS X 10.1.4, Mac OS X 10.1.3, Mac OS X 10.1.2, Mac OS X 10.1.1, Mac OS X 10.1, Mac OS X 10.0.4, Mac OS X 10.0 shipped it.
Match a regular expression against a string
Flags it lists
-
-- -
-about -
-all -
-expanded -
-indices -
-inline -
-line -
-lineanchor -
-linestop -
-nocase -
-start