From: Belorion <belorion@...>
Date: 2005-04-19T01:58:04+09:00
Subject: String.sub strangeness

Forgive me if my Monday fog is preventing me from seeing the simple
answer to this simple problem...

irb-enhanced(main):001:0> str = "123&456"
=> "123&456"
irb-enhanced(main):002:0> str.sub( /\&/, "\\&" )
=> "123&456"
irb-enhanced(main):003:0> str.sub( /\&/, "\\!" )
=> "123\\!456"


Why am I not able to escape the & in the string with an a \ ?  If I do this:

irb-enhanced(main):004:0> str.sub( /\&/, "\\\\&" )
=> "123\\&456"

It seems to work... I'm not sure I understand the (apparent) inconsistency.