diff -r 1182ff8929cc -r e4d90117c5de src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/markup/Links.java
--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/markup/Links.java	Wed Aug 28 15:51:03 2019 +0200
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/markup/Links.java	Tue Sep 24 11:49:48 2019 +0200
@@ -312,7 +312,7 @@
      * @return a valid HTML name
      */
     public String getName(String name) {
-        return name.replaceAll(" +", "");
+        return name.replaceAll("\\s+", "");
     }
 
 }