CODEWITHSUNDEEP
rubyescaping
dany
dany

Reputation: 3

Escaping special character in Ruby

How can I append the string '\x' to a number in Ruby? I have tried '\\x' but it's not working.

Upvotes: 0

Views: 1569

Answers (3)

Mike Woodhouse
Mike Woodhouse

Reputation: 52326

If you're using a single-quoted string for '\x' then you may already have what you want. When Ruby (or to be more accurate, IRB) prints a string with a literal backslash it shows it escaped by default, which is how #p behaves (that's what IRB uses to show results). But the string may only have one blackslash as desired.

num = 123
s = '%d\x' % num  #=> "123\\x" (using the short-hand form for sprintf)

print s #=> 123\x
p s #=> "123\\x"
puts '%d\x' % num #=> 123\x - what the string actually contains

puts num.to_s + '\x'

Note that in Ruby single quoted string literals undergo a lot less substitution than double-quoted ones.

Upvotes: 0

Michael Kohl
Michael Kohl

Reputation: 66867

Without context it's hard to know what you are trying to achieve. Here are some ways (if you really want to append):

"%d\\x" % num
"#{num}\\x"

If you are trying to output hex numbers, this is good:

"\\x%s" % num.to_s(16)

Upvotes: 0

taro
taro

Reputation: 5832

Probably something like:

my_string = 'foo 123 456 bar'
my_string.gsub(/(\d+)/, '\\x\1') # "foo \\x123 \\x456 bar"

Upvotes: 1

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