diff --git a/src/jquery/jquery.js b/src/jquery/jquery.js
index c309428e..81b5b64e 100644
--- a/src/jquery/jquery.js
+++ b/src/jquery/jquery.js
@@ -1313,6 +1313,8 @@ jQuery.extend({
 		// internal only, use is(".class")
 		has: function( t, c ) {
 			t = t.className || t;
+			// escape regex characters
+			c = c.replace(/([\.\\\+\*\?\[\^\]\$\(\)\{\}\=\!\<\>\|\:])/g, "\\$1");
 			return t && new RegExp("(^|\\s)" + c + "(\\s|$)").test( t );
 		}
 	},