I've deleted the 'DirectoryName' column and re added it with the methord you suggested, went with Pauls suggestion (from the post above) and added ^[\w/]+$ in the regex field also had a go at adding two new categories from the Database > Category > Add area with one nested and ran Resync Tables, no joy...
Building category test ...
Making Directory (0777): '/home/virtual/site1/fst/var/www/html/v2/test' ...Made.
Links: 0
Done
Building category test/test2 ...
Making Directory (0777): '/home/virtual/site1/fst/var/www/html/v2/test2' ...Made.
Links: 0
Done
i thank you
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