[ExtendScript] How to move the cursor to any point in text

I want to select text that matches a regular expression with a length of 0, such as `^`, `$`, or `(?=a)`.

If the length is 1, it can be selected using TextRange, but InsertionPoint does not have a method for selecting text. How can I create and move the cursor to any point?

Requirements:

• Must be implemented using only ExtendScript (AppleScript, AutoHotkey, etc., are not allowed in this case)
• Must be compatible with Illustrator version 2021 or later
• A single-step undo state is preferred, but if it can be achieved with multiple steps, it would be good