Load old versions from unpkg for perf tests to simplify future releases

tests/perf/index.html

@@ -23,32 +23,16 @@
         (function() {
             var match = /[?&]version=([^&]+)/.exec(location.search);
             var version = match ? match[1] : null;
-            var knownVersion = {
-                '4.4.0': true,
-                '4.3.1': true,
-                '4.2.4': true,
-                '4.2.3': true,
-                '4.2.0': true,
-                '4.1.1': true,
-                '4.0.0': true,
-                '3.2.0': true,
-                '3.1.1': true,
-                '3.1.0': true,
-                '3.0.0': true,
-                '2.0.0': true,
-                '1.5.1': true
-            };
+            var isValidVersion = /^\d+\.\d+\.\d+(?:-\w+)?$/.test(version);
 
             if (version === null || version === 'latest') {
                 document.write('<script src="../../xregexp-all.js"><\/script>');
-            } else if (knownVersion[version]) {
+            } else if (isValidVersion) {
                 // Hack around ES6 incompatibility in XRegExp versions prior to 3.0.0
                 if (parseInt(version, 10) < 3) {
                     delete RegExp.prototype.sticky;
                 }
-                document.write('<script src="versions/xregexp-all-v'+version+'.js"><\/script>');
-            } else {
-                document.getElementById('log').innerHTML = 'Unrecognized version provided in query';
+                document.write('<script src="https://unpkg.com/xregexp@' + version + '/xregexp-all.js"><\/script>');
             }
         }());
     </script>
@@ -77,8 +61,12 @@
             }
         }());
 
-        // Global run function provided by perf script
-        onload = run;
+        if (typeof XRegExp === 'undefined') {
+            document.getElementById('log').innerHTML = 'Unable to find XRegExp version provided in query at &lt;unpkg.com&gt;';
+        } else {
+            // Global run function provided by perf script
+            onload = run;
+        }
     </script>
 </body>
 </html>