Index: /trunk/src/org/openstreetmap/josm/data/validation/routines/UrlValidator.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/data/validation/routines/UrlValidator.java	(revision 18895)
+++ /trunk/src/org/openstreetmap/josm/data/validation/routines/UrlValidator.java	(revision 18896)
@@ -165,5 +165,5 @@
 
     private static final String PATH_REGEX = "^(/[-\\w:@&?=+,.!/~*'%$_;()]*)?$";
-    private static final Pattern PATH_PATTERN = Pattern.compile(PATH_REGEX, Pattern.UNICODE_CHARACTER_CLASS);
+    private static final Pattern PATH_PATTERN = Pattern.compile(PATH_REGEX);
 
     private static final String QUERY_REGEX = "^(.*)$";
Index: /trunk/test/unit/org/openstreetmap/josm/data/validation/routines/UrlValidatorTest.java
===================================================================
--- /trunk/test/unit/org/openstreetmap/josm/data/validation/routines/UrlValidatorTest.java	(revision 18895)
+++ /trunk/test/unit/org/openstreetmap/josm/data/validation/routines/UrlValidatorTest.java	(revision 18896)
@@ -566,5 +566,6 @@
             new ResultPair("/..//file", false),
             new ResultPair("/test1//file", false),
-            new ResultPair("/projekte-und-themen/eulen-falken-und-deren-nistkästen/trafotürme", true)
+            // non-ascii characters are invalid for URIs. See https://datatracker.ietf.org/doc/html/rfc3986#section-1.2.1
+            new ResultPair("/projekte-und-themen/eulen-falken-und-deren-nistkästen/trafotürme", false)
     };