add markInputRule function

packages/tiptap-extensions/src/marks/Italic.js

@@ -1,5 +1,5 @@
 import { Mark } from 'tiptap'
-import { toggleMark } from 'tiptap-commands'
+import { toggleMark, markInputRule } from 'tiptap-commands'
 
 export default class ItalicMark extends Mark {
 
@@ -28,4 +28,10 @@ export default class ItalicMark extends Mark {
 		return toggleMark(type)
 	}
 
+	inputRules({ type }) {
+		return [
+			markInputRule(/(?:^|[^\*_])(?:\*|_)([^\*_]+)(?:\*|_)$/, type),
+		]
+	}
+
 }