From a4a37d6fc9738c698c99cc8ee7ccaa454f6cc8e3 Mon Sep 17 00:00:00 2001
From: Stephen Paul Weber <singpolyma@singpolyma.net>
Date: Wed, 14 Oct 2015 15:28:38 -0500
Subject: [PATCH] More robust pingback link detection

---
 plugins/Linkback/LinkbackPlugin.php | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/plugins/Linkback/LinkbackPlugin.php b/plugins/Linkback/LinkbackPlugin.php
index a710abd7bf..37c3ef8768 100644
--- a/plugins/Linkback/LinkbackPlugin.php
+++ b/plugins/Linkback/LinkbackPlugin.php
@@ -100,9 +100,9 @@ class LinkbackPlugin extends Plugin
 
         if (array_key_exists('X-Pingback', $result->headers)) {
             $pb = $result->headers['X-Pingback'];
-        } else if (preg_match('/<link rel="pingback" href="([^"]+)" ?\/?>/',
-                              $result->body,
-                              $match)) {
+
+        } else if(preg_match('/<(?:link|a)[ ]+href="([^"]+)"[ ]+rel="[^" ]* ?pingback ?[^" ]*"[ ]*\/?>/i', $result->body, $match)
+                  || preg_match('/<(?:link|a)[ ]+rel="[^" ]* ?pingback ?[^" ]*"[ ]+href="([^"]+)"[ ]*\/?>/i', $result->body, $match)) {
             $pb = $match[1];
         }