As I see in database, this mumber has format 'DDDDDD/DDDD' (D is any digit character) with whitespace before first number, and non-digit character after last number...
It doesn't work, please try it a let me know. I also tried Acceptable use and Payment card category and there is no problem.
Ah, I missed subcondition - you need at least 4 such patterns in the text to trigger this rule. It blocks following text for me:
this is test of CZECH-NHIS-NUM-PATTERN 012345/6789 another pattern 456789/0123 890123/4567 894324/1234 another test
thank you very much, It's working now... :-)