How to apply strict pattern matching for title names in compton config file?

I have a pretty simple config file for compton, just to set my terminal opacity.

-rule = ["85:name *= 'st'"];

However I have found that if any window has a title that contains the letters st in it, then the transparency will apply to that window too. Is there any way to get strict pattern matching in compton when applying opacity, so that opacity is only applied when the title of the window is exactly equal to st, rather than a string containing that substring?