Match_pattern function syntax

Hi,

Could you please give me an example of correct settings of one of the SMAX text function "Match_pattern"?

I have tried to apply in with the business rule "Define suggested values based on filter" to create a selection of records based on if one of their text fields consist string in Match-pattern function, but it have worked properly so far.

I have tried following syntaxes:

${match_pattern('VYS','*')} -> the business rule do not work properly

${match_pattern('VYS',*)} -> SMAX do not allow me to save this syntax

Could you please give me an advice, what is the correct usage?

Thank you very much