Filtering on multiple dots in string value, syntax question

Hi, I couldn’t find the answer in the answers.

I have a string column named Taak (klokuren) (I’m using KNIME v. 5.9) that contains values like

• 1.05 BPV-begeleiding

• 3.2.2.2 KGC Bedrijfsadministratie 9_2312

• 3.3.1 ALA Periodeafsluiting_2312

I want to retain only values with one dot (like 1.05). I’ve tried wildcards (“?.??”), regex pattern and the Rule base Row Filter node, but 1 can’t seem to get the syntax right. Could you please give me a head start?

Thanks in advance

Marc Schoorel