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To allow any pattern this method can return null or Pattern.compile(".*" )
remove org.apache.wicket.markup.html.form.IChoiceRenderer interface WICKET-663
With WICKET-663 we wanted to add a new method to the interface that will allow faster lookup of an object by its id.
It wasn't easy to add this new method because it would break the API.
Since the creation of WICKET-663 until now there was no big benefit of having the interface so we decided to drop it.
Any custom implementations of IChoiceRenderer interface now should extend from ChoiceRenderer class.
Behavior changes
org.apache.wicket.request.Url#getQueryString WICKET-4664
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Migration to Wicket 7.0 