fork download
copy 
  1. rx = /(?:\G(?!\A)|\A(?=(?:#\d\s*)*\z))\s*\K#\d/
  2. p "#1 #2".scan(rx)
  3. p "#1 NO #2".scan(rx)
Success #stdin #stdout 0s 28224KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
["#1", "#2"]
[]
https://ideone.com/jVluVv
language:
Ruby (ruby 2.5.5)
created:
5 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!