[FIXED HUDSON-4894] update DRIVE_PATTERN so a path like C:\ is recognized as absolute

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@23832 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/FilePath.java

@@ -220,7 +220,7 @@ public final class FilePath implements Serializable {
         return rel.startsWith("/") || DRIVE_PATTERN.matcher(rel).matches();
     }
 
-    private static final Pattern DRIVE_PATTERN = Pattern.compile("[A-Za-z]:\\\\.+");
+    private static final Pattern DRIVE_PATTERN = Pattern.compile("[A-Za-z]:\\\\.*");
 
     /**
      * Checks if the remote path is Unix.