golang-rsc-binaryregexp-dev 0.2.0-3 (amd64 binary) in ubuntu lunar

 Go package regexp implements regular expression search.
 .
 The syntax of the regular expressions accepted is the same general syntax
 used by Perl, Python, and other languages. More precisely, it is the
 syntax accepted by RE2 and described at https://golang.org/s/re2syntax,
 except for \C. For an overview of the syntax, run
 .
     go doc regexp/syntax
 .
 The regexp implementation provided by this package is guaranteed
 to run in time linear in the size of the input. (This is a property
 not guaranteed by most open source implementations of regular
 expressions.) For more information about this property, see
 .
     https://swtch.com/~rsc/regexp/regexp1.html
 .
 or any book about automata theory.
 .
 All characters are UTF-8-encoded code points.