From: Brian Candler <b.candler@...>
Date: 2011-02-27T18:20:15+09:00
Subject: Re: regex gsub

Lorenzo Brito Morales wrote in post #984075:
> i have already working these phone.gsub(regex, "<
> #{regex.match(phone)} >" ) but i think is another way to do it not?
> like phone.gsub(regex,"< \1 >")
> but the last instrucction does not bring the regex.match

It's to do with how double-quoted strings interpret backslashes.

irb(main):001:0> "< \1 >"
=> "< \001 >"
irb(main):002:0> '< \1 >'
=> "< \\1 >"
irb(main):003:0> "< \\1 >"
=> "< \\1 >"
irb(main):004:0> "< \\1 >".size
=> 6
irb(main):005:0> puts "< \\1 >"
< \1 >
=> nil

Note that "< \\1 >" contains a *single* backslash - a backslash escaped 
with a backslash :-)

But you'd probably be better using the block form of gsub anyway:

phone.gsub(regex) { "< #{$&} >" }

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