JQuery selector question for classes / ids containing the same number

My website has a set of elements with the classes "element1", "element2", "element3", etc, and also another set containing elements with the classes "1", "2", "3". These are not directly related in the DOM so I cannot use parent / child selectors. I want to write a JQuery script that, when the user hovers on "element1", triggers an effect / function in "1". Of course, I don't want to write all the pairings manually. How could I write this code so the selectors "detect" the number in the class names? Do I need to use regular expressions? I can change my HTML if needed.

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