Counting words with four characters or more

Hello,
I need to know how many words with four characters or more are in my LibreOffice Writer documents. Is there a way to set word counting preferences and calculate this number?
Thank you

Open the full search & replace tool (Ctrl H), check the use of regular expressions and write

(\w){4,}

on the search box. Now, click on Find All and read the number of words on the status bar, in the lower part of Writer’s window

Thanks a lot for the immediate response and the solution. It works just fine! I really appreciate it.
ktheof