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how to specify a validation rule of "?" when posting a question. And if not then output a warning message?

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You will need to write a plugin with a filter module. Here are the plugin tutorial and the filter module docs:

http://docs.question2answer.org/plugins/tutorial/

http://docs.question2answer.org/plugins/modules-filter

Specifically, take a look at the filter_question method.

You can use this plugin as a reference: https://github.com/pupi1985/q2a-maximum-tag-length

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