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Searching invalid or special characters in file names

Question / Problem

How do I search for invalid file names using Treesize?

Answer / Solution

Open the Treesize File Search, enable only the "Advanced Search", and define a filter on the right for "Name matches Regular Expression" and one of these patterns:

 [^[:print:]]  if you want to treat all non-ASCII characters as invalid (which would e.g. also treat German umlauts as invalid)

 [^\P{C}]  if you want to treat all non-printable Unicode characters as invalid
 
It can also make sense to search for files containing the non-breakable space (Unicode NOBR U+00A0). To find them, use the pattern [\xA0].

To search for specific characters like percent and ampersand use the regular expression [&%]. You can find more examples on searching with regular expressions in the manual.

You can get rid of unwanted characters using the bulk renamer of TreeSize.