URL Encodings

URL Encoding, specifically Percent-encoding, is one of common encodings that you may use in arbitorary programming languages.

Let me encode a text into URL Encoding, which includes UTF-8 Japanese characters.

JavaScript (node.js)

Use encodeURIComponent.

var sys = require('sys');
sys.puts(encodeURIComponent('abc あいう-#!@'));

result:

abc%20%E3%81%82%E3%81%84%E3%81%86-%23!%40

Note that escape and encodeURI aren't proper for URI encoding.

sys.puts(escape('abc あいう-#!@'));
//=> abc%20%u3042%u3044%u3046-%23%21@
sys.puts(encodeURI('abc あいう-#!@'));
//=> abc%20%E3%81%82%E3%81%84%E3%81%86-#!@
sys.puts(encodeURIComponent('abc あいう-#!@'));
//=> abc%20%E3%81%82%E3%81%84%E3%81%86-%23!%40

(Thanks @javascripter!)

Ruby

Use ERB::Util.url_encode.

# coding: utf-8
require 'erb'
puts ERB::Util.url_encode 'abc あいう-#!@'

result:

abc%20%E3%81%82%E3%81%84%E3%81%86-%23%21%40

This result is exactly same to JavaScript's except for "!".

Note that URI.encode or URI.encode_www_form_component aren't proper.

require 'uri'
puts URI.encode 'abc あいう-#!@'
#=> abc%20%E3%81%82%E3%81%84%E3%81%86-%23!@
puts URI.encode_www_form_component 'abc あいう-#!@'
#=> abc+%E3%81%82%E3%81%84%E3%81%86-%23%21%40

Python

Use urllib.quote.

# coding: utf-8
import urllib
print urllib.quote('abc あいう-#!@')

result:

abc%20%E3%81%82%E3%81%84%E3%81%86-%23%21%40

(Thanks @raa0121!)

Vim script

Use Vital.Web.Http.encodeURI.

let H = vital#of('vital').import('Web.Http')
echo H.encodeURI('abc あいう-#!@')

result:

abc%20%E3%81%82%E3%81%84%E3%81%86-%23%21%40

Haskell

Use Network.HTTP.urlEncode. But...

import Network.HTTP (urlEncode)
main = putStrLn $ urlEncode "abc あいう-#!@"

result:

abc%20%30%42%30%44%30%46-%23%21%40

oh...