URL decoding: Difference between revisions
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* The encoded string "<code><nowiki>google.com/search?q=%60Abdu%27l-Bah%C3%A1</nowiki></code>" should revert to the unencoded form "<code><nowiki>google.com/search?q=`Abdu'l-Bahá</nowiki></code>".
* The encoded string "<code><nowiki>%25%32%35</nowiki></code>" should revert to the unencoded form "<code><nowiki>%25</nowiki></code>" and '''not''' "<code><nowiki>%</nowiki></code>".
<br><br>
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=={{header|AutoHotkey}}==
<syntaxhighlight lang="autohotkey">
UriDecode(Uri) {
LoopOffset := 0
VarSetCapacity(Var, StrPut(Uri, "UTF-8"), 0)
{
If (A_Index < LoopOffset) {
If (A_LoopField = Chr(37)) {
Number := "0x" . SubStr(Uri, A_Index + 1, 2)
LoopOffset := A_Index + 3
}
Else {
Number := Ord(A_LoopField)
}
NumPut(Number, Var, VarLength++, "UChar")
}
Return StrGet(&Var, VarLength, "UTF-8")
}
MsgBox % UriDecode("http%3A%2F%2Ffoo%20bar%2F")
MsgBox % UriDecode("google.com/search?q=%60Abdu%27l-Bah%C3%A1")
MsgBox % UriDecode("%25%32%35")
</syntaxhighlight>
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=={{header|Java}}==
Java offers the ''URLDecoder'' and ''URLEncoder'' classes for this specific task.
<syntaxhighlight lang="java">
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
</syntaxhighlight>
<syntaxhighlight lang="java">
URLDecoder.decode("http%3A%2F%2Ffoo%20bar%2F", StandardCharsets.UTF_8)
</syntaxhighlight>
Alternately, you could use a regular expression capture
<syntaxhighlight lang="java">
import java.util.regex.Matcher;
import java.util.regex.Pattern;
</syntaxhighlight>
<syntaxhighlight lang="java">
String decode(String string) {
Pattern pattern = Pattern.compile("%([A-Za-z\\d]{2})");
Matcher matcher = pattern.matcher(string);
StringBuilder decoded = new StringBuilder(string);
char character;
int start, end, offset = 0;
while (matcher.find()) {
character = (char) Integer.parseInt(matcher.group(1), 16);
/* offset the matched index since were adjusting the string */
start = matcher.start() - offset;
end = matcher.end() - offset;
decoded.replace(start, end, String.valueOf(character));
offset += 2;
}
return decoded.toString();
}
</syntaxhighlight>
<pre>
http://foo bar/
google.com/search?q=`Abdu'l-Bahá
</pre>
=={{header|JavaScript}}==
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</syntaxhighlight>
=={{header|langur}}==
<syntaxhighlight lang="langur">
val finish = fn s:b2s(map(fn x:number(x, 16), rest(split("%", s))))
val decode = fn s:replace(s, re/(%[0-9A-Fa-f]{2})+/, finish)
writeln decode("http%3A%2F%2Ffoo%20bar%2F")
writeln decode("google.com/search?q=%60Abdu%27l-Bah%C3%A1")
</syntaxhighlight>
{{out}}
<pre>http://foo bar/
google.com/search?q=`Abdu'l-Bahá
</pre>
=={{header|Lasso}}==
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mailto:"Irma User" <irma.user@mail.com>
</pre>
=={{header|PascalABC.NET}}==
<syntaxhighlight lang="delphi">
uses System;
function URLDecode(s: string) := Uri.UnescapeDataString(s);
begin
Println(URLDecode('http%3A%2F%2Ffoo%20bar%2F'));
Println(URLDecode('google.com/search?q=%60Abdu%27l-Bah%C3%A1'));
Println(URLDecode('%25%32%35'));
end.
</syntaxhighlight>
{{out}}
<pre>
http://foo bar/
google.com/search?q=`Abdu'l-Bahá
%25
</pre>
=={{header|Perl}}==
Line 1,640 ⟶ 1,707:
works like ''fromPercentEncoded'' and additionally decodes '+' with a space.
Both functions return byte sequences.
To decode Unicode characters it is necessary to convert them from UTF-8 with
<syntaxhighlight lang="seed7">$ include "seed7_05.s7i";
include "encoding.s7i";
Line 1,840 ⟶ 1,907:
Decoded URL: http://foo barè/</pre>
=={{header|V (Vlang)}}==
<syntaxhighlight lang="v (vlang)">import net.urllib
fn main() {
for escaped in [
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=={{header|Wren}}==
{{libheader|Wren-fmt}}
<syntaxhighlight lang="
var urlDecode = Fn.new { |enc|
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