问题
I have a string with non-printable characters.
What I am currently doing is replacing them with a tilde using:
string.gsub!(/^[:print:]]/, "~")
However, I would actually like to convert them to their integer value.
I tried this, but it always outputs 0
string.gsub!(/[^[:print:]]/, "#{$1.to_i}")
Thoughts?
回答1:
String#gsub, String#gsub! accept optional block. The return value of the block is used for substitution.
"\x01Hello\x02".gsub(/[^[:print:]]/) { |x| x.ord }
# => "1Hello2"
回答2:
Object#inspect is also an option if you just need to output string with non-printable characters to log or for debug purposes.
puts "\x01Hello\x02".inspect
# => "\u0001Hello\u0002"
来源：https://stackoverflow.com/questions/20146704/ruby-convert-non-printable-characters-into-numbers