urldecode codes euro sign as %u2AC instead of %u20AC

Hi @wladekarek, does it help when you replace "%u20AC" with "%E2%82%AC"?

Test this

<cfscript>

msg="It costs %E2%82%AC 5.";

msg = urldecode(msg, "UTF-8");

writeoutput(msg);

</cfscript>

For details see, for example, the StackOverflow post on how to convert from Unicode to UTF-8 Hex. In your particular case, the steps are as follows:

Unicode value = 20AC

Binary value = 10000010101100

The Unicode value U+20AC is in the range 0x00000800 - 0x0000FFFF range (0x4E3E - 0xFFFF). So its Hex representation will be of the form:

   1110xxxx 10xxxxxx 10xxxxxx

where the x represents digits taken in order from the binary value, progressing from right to left. Starting therefore with the rightmost, and filling the 6 x positions with the digits, we get

10101100 (note: 101100 are the rightmost 6 digits of the binary value, 10000010101100)

Next, the representation in the middle. It is

10000010 (note: 000010 are the next 6 digits of the binary value, 10000010101100, going from right to left)

Lastly, the leftmost representation. It is

1110xx10 (note: 10 are the remaining digits of the binary value, 10000010101100, going from right to left).

This becomes 11100010, as the rules also say that we must replace any remaining x with 0.

The final Hex representation is therefore

11100010   10000010  10101100

Converting each binary back to Hex, we get

%E2%82%AC

Can you please post your code as you run it?

I run

<cfset msg = "%u20AC">
<cfdump var="#urldecode(msg,"utf-8")#">
<cfoutput>#urldecode(msg,"utf-8")#</cfoutput>

and it looks good to me.

What ColdFusion version are you on?