Revert "Revert "Minor.""

This reverts commit 1c46929.

Author: loveencounterflow

src/xregexp.js

@@ -1573,7 +1573,7 @@ var XRegExp = (function(undefined) {
     );
 
 /* Named backreference: `\k<name>`. Backreference names can use the characters A-Z, a-z, 0-9, _,
- * and $ only.
+ * and $ only. Also allows numbered backreferences as `\k<n>`.
  */
     add(
         /\\k<([\w$]+)>/,

tests/perf/perf.js

@@ -191,8 +191,9 @@
 
     (function() {
         var str = Array(30 + 1).join('hello world ') + 'http://xregexp.com/path/to/file?q=1';
-        var regexp = new RegExp('\\b([^:/?\\s]+)://([^/?\\s]+)([^?\\s]*)\\??([^\\s]*)');
-        var xregexp   = XRegExp('\\b([^:/?\\s]+)://([^/?\\s]+)([^?\\s]*)\\??([^\\s]*)');
+        var pattern = '\\b([^:/?\\s]+)://([^/?\\s]+)([^?\\s]*)\\??([^\\s]*)';
+        var regexp = new RegExp(pattern);
+        var xregexp = XRegExp(pattern);
 
         suites.push(Benchmark.Suite('Regex object type')
             .add('RegExp object', function() {

xregexp-all.js

@@ -1605,7 +1605,7 @@ var XRegExp = (function(undefined) {
     );
 
 /* Named backreference: `\k<name>`. Backreference names can use the characters A-Z, a-z, 0-9, _,
- * and $ only.
+ * and $ only. Also allows numbered backreferences as `\k<n>`.
  */
     add(
         /\\k<([\w$]+)>/,