Counting words with four characters or more

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


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.