Regexp#source behaviour has changed in MRI 2

[chrisseaton]

It looks like the Regexp#source behaviour changed has in MRI. I couldn't immediately see how to fix this. It doesn't appear to be covered by RubySpec yet.

$ ~/.rbenv/versions/1.8.7-p375/bin/ruby ../test.rb 
"/"
"\\/"

$ ~/.rbenv/versions/1.9.3-p550/bin/ruby ../test.rb 
"/"
"\\/"

$ ~/.rbenv/versions/2.0.0-p594/bin/ruby ../test.rb 
"/"
"/"

$ ~/.rbenv/versions/rbx-2.2.10/bin/ruby ../test.rb 
"/"
"\\/"

$ bin/jruby ../test.rb 
"/"
"\\/"

$ cat ../test.rb 
p %r[/].source
p /\//.source

[cremno]

It isn't just Regexp#source. The regular expressions themselves are different until MRI/CRuby 2.0.0. But %r[/] being the same as /\// makes sense, doesn't it?

[kares]

all seems well in ~ current JRuby 9K :

jruby-9.1.15.0 :001 > p %r[/].source
"/"
 => "/" 
jruby-9.1.15.0 :002 > p /\//.source
"/"
 => "/"