RosettaCodeData/Task/URL-encoding/Langur/url-encoding.langur

val urlEncode = fn(s) {
	replace(
	    s,
        by=re/[^A-Za-z0-9]/,
	    with=fn r:join(map(s2b(r), by=fn b:"%{{b:X02}}")),
	)
}

writeln urlEncode("https://some website.com/")