diff --git a/program/js/common.js b/program/js/common.js
index c44169cdc..fd7fda3be 100644
--- a/program/js/common.js
+++ b/program/js/common.js
@@ -418,7 +418,7 @@ function rcube_check_email(input, inline, count, strict)
       atom = '[^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+',
       quoted_pair = '\\x5c[\\x00-\\x7f]',
       quoted_string = '\\x22('+qtext+'|'+quoted_pair+')*\\x22',
-      ipv4 = '\\[(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}\\]',
+      ipv4 = '\\[(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}\\]',
       ipv6 = '\\[IPv6:[0-9a-f:.]+\\]',
       ip_addr = '(' + ipv4 + ')|(' + ipv6 + ')',
       // Use simplified domain matching, because we need to allow Unicode characters here
@@ -436,7 +436,7 @@ function rcube_check_email(input, inline, count, strict)
         '\\u0909\\u0926\\u093e\\u0939\\u0930\\u0923\\x2e\\u092a\\u0930\\u0940\\u0915\\u094d\\u0937\\u093e',
         '\\u4f8b\\u3048\\x2e\\u30c6\\u30b9\\u30c8',
         '\\uc2e4\\ub840\\x2e\\ud14c\\uc2a4\\ud2b8',
-        '\\u0645\\u062b\\u0627\\u0644\\x2e\\u0622\\u0632\\u0645\\u0627\\u06cc\\u0634\u06cc',
+        '\\u0645\\u062b\\u0627\\u0644\\x2e\\u0622\\u0632\\u0645\\u0627\\u06cc\\u0634\\u06cc',
         '\\u043f\\u0440\\u0438\\u043c\\u0435\\u0440\\x2e\\u0438\\u0441\\u043f\\u044b\\u0442\\u0430\\u043d\\u0438\\u0435',
         '\\u0b89\\u0ba4\\u0bbe\\u0bb0\\u0ba3\\u0bae\\u0bcd\\x2e\\u0baa\\u0bb0\\u0bbf\\u0b9f\\u0bcd\\u0b9a\\u0bc8',
         '\\u05d1\\u05f2\\u05b7\\u05e9\\u05e4\\u05bc\\u05d9\\u05dc\\x2e\\u05d8\\u05e2\\u05e1\\u05d8'