Ruby

Hi, everyone.

I am trying to write a code similar to this

#!/usr/bin/env ruby def check(f1) f2 = ->(match) { p match; p $~ } data = "hello test test test" data.gsub(/test/, &f1) data.gsub(/test/, &f2) end check(->(match) { p match; p $~ }) 

output:

"test" nil "test" nil "test" nil "test" #<MatchData "test"> "test" #<MatchData "test"> "test" #<MatchData "test"> 

ruby versions:
ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin18]
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin18]

Why does the global variable ($~) in f1 and f2 work differently? It's a bug or my mistake?