urlencode Function

urlencode applies URL encoding to a given string.

This function identifies characters in the given string that would have a special meaning when included as a query string argument in a URL and escapes them using RFC 3986 "percent encoding".

The exact set of characters escaped may change over time, but the result is guaranteed to be interpolatable into a query string argument without inadvertently introducing additional delimiters.

If the given string contains non-ASCII characters, these are first encoded as UTF-8 and then percent encoding is applied separately to each UTF-8 byte.

Examples

> urlencode("Hello World")
Hello%20World
> urlencode("☃")
%E2%98%83
> "http://example.com/search?q=${urlencode("packer urlencode")}"
http://example.com/search?q=packer%20urlencode