Is there a way to set the wild char when type in pattern?

[woshichuanqilz]

Sometimes when I meet the pattern "j=" "k+" "k_" which is hard to

press the second char. So is there a way to set a wild char to match any char?

For example I press "j*" can match any two char pattern start with j

[ggandor]

You can use equivalence_classes (mutual aliases), but wildcard characters like in your suggestion are impossible if you want ahead-of-time displayed labels. Think about it: when targeting k+, after pressing k, the plugin cannot know whether you will type + or * (the wildcard character), so it cannot decide which label to show (the labels are different in the two cases, since the wildcard would match a lot more targets).