sdedic commented on a change in pull request #2969:
URL: https://github.com/apache/netbeans/pull/2969#discussion_r640992119



##########
File path: 
platform/openide.filesystems/src/org/openide/filesystems/FileUtil.java
##########
@@ -2337,6 +2341,29 @@ private static boolean isArchiveFileImpl(final URL url, 
final boolean strict) {
         }
         return archiveRootProviderCache;
     }
+    
+    /**
+     * Hardcoded offending filename characters. Windows are more picky than 
Unixes; relying
+     * on just the current host OS will limit file portability when shared 
through VCS.
+     */
+    private static final Pattern ILLEGAL_FILENAME_CHARACTERS = 
Pattern.compile("[\\/:\"*?<>|]");
+    
+    /**
+     * Determines whether the string forms a valid filename (without a path 
component).
+     * @param fileName candidate string
+     * @return true, if the string can be used to name a file.
+     */

Review comment:
       @lkishalmi the initial impl of the utility is a separate commit here. 
The retrofit **will** be a separate PR (as well as the possible extension of 
the checks). I wonder :)) what happens when I place `CON` files to git on Linux 
and clone it to Windows ... ;)




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