diff --git a/src/static/optionPage.html b/src/static/optionPage.html
index 6e32c60d..5ec6dd3f 100644
--- a/src/static/optionPage.html
+++ b/src/static/optionPage.html
@@ -376,7 +376,7 @@ <h4 id="domainFrameModeHeader" class="sectionHeader">Frame Mode</h4>
     <h4 id="domainsHeader" class="sectionHeader">Domains</h4>
     <select id="domainSelect" class="w3-select w3-border small textInput" style="display:block"></select>
     <h4 id="domainHeader" class="sectionHeader">Domain</h4>
-    <input id="domainText" class="w3-input w3-border small" type="text" pattern="^([a-zA-Z0-9\.-]+\.[a-zA-Z0-9\.-]+|localhost)$"/>
+    <input id="domainText" class="w3-input w3-border small" type="text" pattern="^([a-zA-Z0-9.-]+\.[a-zA-Z0-9.-]+|localhost)$"/>
     <span id="domainTextNote" class="notes">Example: 'google.com' or 'mail.google.com'</span>
 
     <div style="padding-top: 8px;">