String substitution bug

[Martin Schoettler]

(Ruby 1.8.1, Linux and Windows)

puts "a\\b".sub( /\\/, "\\\\" )
yields
a\b
(I expected: a\\b)

But
puts "a\\b".sub( /\\/, "\\x\\" )
yields
a\x\b
(as I would expect.)

BTW: Mails to (e-mail address removed) are rejected. Is there a new mail
adress for bugs?

 

[ts]

M> puts "a\\b".sub( /\\/, "\\\\" )

This is not a bug, see

http://www.rubycentral.com/faq/rubyfaq-9.html#ss9.18


Guy Decoux

 

[Kristof Bastiaensen]

(Ruby 1.8.1, Linux and Windows)

puts "a\\b".sub( /\\/, "\\\\" )
yields
a\b
(I expected: a\\b)

But
puts "a\\b".sub( /\\/, "\\x\\" )
yields
a\x\b
(as I would expect.)

BTW: Mails to (e-mail address removed) are rejected. Is there a new mail
adress for bugs?

Hi,

I don't know about bugs, but this however is not bug,
but a feature
When using a replacement string, gsub does another
elimination step for backslashes, because "\1" and "\2"
have a special meaning. So first "\\\\" will be translated
to "\\" for the quoted string, and the second time it will
be translated to "\" by gsub. In the second case however gsub
will see "\x\", and since "\x" doesn't have a special meaning
it will be kept.

Regards,
Kristof