Event matching by regular expression matching on URLs.

chrome/common/extensions/api/events.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "events",
     "internal": true,
     "unprivileged": true,
     "types": [
@@ skipping 246 matching lines @@
           "urlContains": {
             "type": "string",
             "description": "Matches if the URL (without fragment identifier) contains a specified string. Port numbers are stripped from the URL if they match the default port number.",
             "optional": true
           },
           "urlEquals": {
             "type": "string",
             "description": "Matches if the URL (without fragment identifier) is equal to a specified string. Port numbers are stripped from the URL if they match the default port number.",
             "optional": true
           },
+          "urlMatches": {
+            "type": "string",
+            "description": "Matches if the URL (without fragment identifier) matches a specified regular expression. Port numbers are stripped from the URL if they match the default port number. The regular expressions use the <a href=\"http://code.google.com/p/re2/wiki/Syntax\">RE2 syntax</a>.",
+            "optional": true
+          },
           "urlPrefix": {
             "type": "string",
             "description": "Matches if the URL (without fragment identifier) starts with a specified string. Port numbers are stripped from the URL if they match the default port number.",
             "optional": true
           },
           "urlSuffix": {
             "type": "string",
             "description": "Matches if the URL (without fragment identifier) ends with a specified string. Port numbers are stripped from the URL if they match the default port number.",
             "optional": true
           },
@@ skipping 13 matching lines @@
                 {"type": "array", "items": {"type": "integer"}, "description": "A pair of integers identiying the start and end (both inclusive) of a port range."}
               ]
             }
           }
         }
       }
     ]
   }
 ]