Unity Script Reference:

static function UnEscapeURL(s: string, e: Encoding = System.Text.Encoding.UTF8): string;

static string UnEscapeURL(string s, Encoding e = System.Text.Encoding.UTF8);

static def UnEscapeURL(s as string, e as Encoding = System.Text.Encoding.UTF8) as string

Parameters

s	A string containing escaped characters.
e	The text encoding to use.

Description

Converts URL-friendly escape sequences back to normal text.

Certain text characters have special meanings when present in URLs. If you need to include those characters in URL parameters then you must represent them with escape sequences. This function takes a string containing these escape sequences and converts them back to normal text.

function Start () {
	// Plain name is "Fish & Chips".
	var plainName = WWW.UnEscapeURL('Fish+%26+Chips');
}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Start() {
        string plainName = WWW.UnEscapeURL("Fish+%26+Chips");
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Start() as void:
		plainName as string = WWW.UnEscapeURL('Fish+%26+Chips')