From 7859b8539193c7ddbfe97866fc63562ec23cb819 Mon Sep 17 00:00:00 2001
From: Miguel Alatzar <migbot@users.noreply.github.com>
Date: Fri, 3 May 2019 13:18:41 -0700
Subject: [PATCH] Use numbered capture over named capture (#2765)

---
 app/utils/file.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/app/utils/file.js b/app/utils/file.js
index 586571908..6ff4a37a9 100644
--- a/app/utils/file.js
+++ b/app/utils/file.js
@@ -10,7 +10,7 @@ import {lookupMimeType} from 'mattermost-redux/utils/file_utils';
 import {DeviceTypes} from 'app/constants/';
 
 const EXTRACT_TYPE_REGEXP = /^\s*([^;\s]*)(?:;|\s|$)/;
-const CONTENT_DISPOSITION_REGEXP = /inline;filename=".*\.(?<ext>[a-z]+)";/i;
+const CONTENT_DISPOSITION_REGEXP = /inline;filename=".*\.([a-z]+)";/i;
 const {DOCUMENTS_PATH, IMAGES_PATH, VIDEOS_PATH} = DeviceTypes;
 const DEFAULT_SERVER_MAX_FILE_SIZE = 50 * 1024 * 1024;// 50 Mb
 
@@ -238,7 +238,7 @@ export function getLocalFilePathFromFile(dir, file) {
 
 export function getExtensionFromContentDisposition(contentDisposition) {
     const match = CONTENT_DISPOSITION_REGEXP.exec(contentDisposition);
-    let extension = match && match.groups.ext;
+    let extension = match && match[1];
     if (extension) {
         if (!Object.keys(types).length) {
             populateMaps();