Un-escaping hexadecimal code

[Iñaki Baz Castillo]

Hi, I receive a String allowing hexadecimal escaping by using %XX syntax:

%61lice =3D> alice ( %61 =3D=3D a )

I would like to un-escape the string. I've got it using "eval" but I'd pref=
er=20
avoiding using "eval":

string =3D "%61lice"
string =3D eval %{ "#{ string.gsub(/%/,'\x') }" }
=3D> "alice"

How could I avoid the usage of "eval" to un-escape the string?

Thanks a lot.

=20


=2D-=20
I=C3=B1aki Baz Castillo

 

[Iñaki Baz Castillo]

El Viernes, 20 de Febrero de 2009, I=C3=B1aki Baz Castillo escribi=C3=B3:

Hi, I receive a String allowing hexadecimal escaping by using %XX syntax:

%61lice =3D> alice ( %61 =3D=3D a )

I would like to un-escape the string. I've got it using "eval" but I'd
prefer avoiding using "eval":

string =3D "%61lice"
string =3D eval %{ "#{ string.gsub(/%/,'\x') }" }
=3D> "alice"

How could I avoid the usage of "eval" to un-escape the string?

Ops, it is easier than above. CGI lib already does it:

require 'cgi'
CGI.unescape("%61lice")
=3D> "alice"





=2D-=20
I=C3=B1aki Baz Castillo

 

[Iñaki Baz Castillo]

El Viernes, 20 de Febrero de 2009, Jeff Schwab escribi=C3=B3:

s.gsub! /%(\d+)/ do |match|
$1.to_i(16).chr
end
puts s

You might also consider supporting escaped % literals.

It fails since it should be:

s.gsub! /%(\d\d)/ do |match|
$1.to_i(16).chr
end

Without this change it would fail when matching:

"%61123"


But fixing it then it works well, thanks a lot


=2D-=20
I=C3=B1aki Baz Castillo

 

[Iñaki Baz Castillo]

El Viernes, 20 de Febrero de 2009, Jeff Schwab escribi=C3=B3:

s.gsub! /%(\d+)/ do |match|
$1.to_i(16).chr
end
puts s

You might also consider supporting escaped % literals.

Also, it should consider not just number but A-F

=2D-=20
I=C3=B1aki Baz Castillo

 

[Igor Pirnovar]

El Viernes, 20 de Febrero de 2009, Jeff Schwab escribió:

Also, it should consider not just number but A-F

s = "%4Flice"
s.gsub! /%([\da-fA-F][\da-fA-F])/ { $1.to_i(16).chr }
puts s

 

[Igor Pirnovar]

SyntaxError: compile error
(irb):2: syntax error, unexpected '{', expecting $end
s.gsub! /%([\da-fA-F][\da-fA-F])/ { $1.to_i(16).chr }
^

Sorry, in Ruby 1.9 this is no longer a Syntax Error