Allow any protocol in the duplicate slashes normalization (#115)

Author: gcox

index.js

@@ -117,7 +117,7 @@ const normalizeUrl = (urlString, options) => {
 
 	// Remove duplicate slashes if not preceded by a protocol
 	if (urlObj.pathname) {
-		urlObj.pathname = urlObj.pathname.replace(/(?<!https?:)\/{2,}/g, '/');
+		urlObj.pathname = urlObj.pathname.replace(/(?<!\b(?:[a-z][a-z\d+\-.]{1,50}:))\/{2,}/g, '/');
 	}
 
 	// Decode URI octets

test.js

@@ -205,6 +205,18 @@ test('remove duplicate pathname slashes', t => {
 	t.is(normalizeUrl('http://sindresorhus.com///foo'), 'http://sindresorhus.com/foo');
 	t.is(normalizeUrl('http://sindresorhus.com:5000//foo'), 'http://sindresorhus.com:5000/foo');
 	t.is(normalizeUrl('http://sindresorhus.com//foo'), 'http://sindresorhus.com/foo');
+	t.is(normalizeUrl('http://sindresorhus.com/s3://sindresorhus.com'), 'http://sindresorhus.com/s3://sindresorhus.com');
+	t.is(normalizeUrl('http://sindresorhus.com/s3://sindresorhus.com//foo'), 'http://sindresorhus.com/s3://sindresorhus.com/foo');
+	t.is(normalizeUrl('http://sindresorhus.com//foo/s3://sindresorhus.com'), 'http://sindresorhus.com/foo/s3://sindresorhus.com');
+	t.is(normalizeUrl('http://sindresorhus.com/git://sindresorhus.com'), 'http://sindresorhus.com/git://sindresorhus.com');
+	t.is(normalizeUrl('http://sindresorhus.com/git://sindresorhus.com//foo'), 'http://sindresorhus.com/git://sindresorhus.com/foo');
+	t.is(normalizeUrl('http://sindresorhus.com//foo/git://sindresorhus.com//foo'), 'http://sindresorhus.com/foo/git://sindresorhus.com/foo');
+	t.is(normalizeUrl('http://sindresorhus.com/a://sindresorhus.com//foo'), 'http://sindresorhus.com/a:/sindresorhus.com/foo');
+	t.is(normalizeUrl('http://sindresorhus.com/alongprotocolwithin50charlimitxxxxxxxxxxxxxxxxxxxx://sindresorhus.com//foo'), 'http://sindresorhus.com/alongprotocolwithin50charlimitxxxxxxxxxxxxxxxxxxxx://sindresorhus.com/foo');
+	t.is(normalizeUrl('http://sindresorhus.com/alongprotocolexceeds50charlimitxxxxxxxxxxxxxxxxxxxxx://sindresorhus.com//foo'), 'http://sindresorhus.com/alongprotocolexceeds50charlimitxxxxxxxxxxxxxxxxxxxxx:/sindresorhus.com/foo');
+	t.is(normalizeUrl('http://sindresorhus.com/a2-.+://sindresorhus.com'), 'http://sindresorhus.com/a2-.+://sindresorhus.com');
+	t.is(normalizeUrl('http://sindresorhus.com/a2-.+_://sindresorhus.com'), 'http://sindresorhus.com/a2-.+_:/sindresorhus.com');
+	t.is(normalizeUrl('http://sindresorhus.com/2abc://sindresorhus.com'), 'http://sindresorhus.com/2abc:/sindresorhus.com');
 });
 
 test('data URL', t => {