Editor::actionDialog regex doesn't match allowed bb-code definitions


Well-known member
Affected version
XF\Pub\Controller\Editor::actionDialog is invoked by the front-end XF.EditorHelpers.loadDialog function which often tags a bb-code tag and then returns a dialog for it.

However actionDialog uses the regex '/[^a-zA-Z0-9]/' while a bb-codes use the regex /^[a-z0-9_]*$/i.

This means _ is stripped from the argument when calling XF\Pub\Controller\Editor::loadDialog makes matching to the exact bb-code much harder than it should be (as it isn't possible to determine if a dialog for bbcode_a and bbcodea or is being requested).
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