diff --git a/src/lib/isDate.js b/src/lib/isDate.js
index f0b28917a..22b644bec 100644
--- a/src/lib/isDate.js
+++ b/src/lib/isDate.js
@@ -22,7 +22,7 @@ function zip(date, format) {
 }
 
 export default function isDate(input, options) {
-  if (typeof options === 'string') { // Allow backward compatbility for old format isDate(input [, format])
+  if (typeof options === 'string') { // Allow backward compatibility for old format isDate(input [, format])
     options = merge({ format: options }, default_date_options);
   } else {
     options = merge(options, default_date_options);
diff --git a/src/lib/isEmail.js b/src/lib/isEmail.js
index 12938765e..ecd88d106 100644
--- a/src/lib/isEmail.js
+++ b/src/lib/isEmail.js
@@ -20,7 +20,8 @@ const default_email_options = {
 /* eslint-disable max-len */
 /* eslint-disable no-control-regex */
 const splitNameAddress = /^([^\x00-\x1F\x7F-\x9F\cX]+)</i;
-const emailUserPart = /^[a-z\d!#\$%&'\*\+\-\/=\?\^_`{\|}~]+$/i;
+// Updated regular expression pattern for email user part validation
+const emailUserPart = /^[a-zA-Z0-9!#$%&'*+/=?^_`{|}~\-]+(\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~\-]+)*$/;
 const gmailUserPart = /^[a-z\d]+$/;
 const quotedEmailUser = /^([\s\x01-\x08\x0b\x0c\x0e-\x1f\x7f\x21\x23-\x5b\x5d-\x7e]|(\\[\x01-\x09\x0b\x0c\x0d-\x7f]))*$/i;
 const emailUserUtf8Part = /^[a-z\d!#\$%&'\*\+\-\/=\?\^_`{\|}~\u00A1-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+$/i;