diff --git a/lib/url-state-machine.js b/lib/url-state-machine.js
index 7fe2074..a560315 100644
--- a/lib/url-state-machine.js
+++ b/lib/url-state-machine.js
@@ -442,7 +442,7 @@ function domainToASCII(domain, beStrict = false) {
 }
 
 function trimControlChars(url) {
-  return url.replace(/^[\u0000-\u001F\u0020]+|(?:[^\u0000-\u001F\u0020][\u0000-\u001F\u0020]+)$/ug, "");
+  return url.replace(/^[\u0000-\u001F\u0020]+|(?:(?<=[^\u0000-\u001F\u0020])[\u0000-\u001F\u0020]+)$/ug, "");
 }
 
 function trimTabAndNewline(url) {