PHP - 为什么我被警告我的正则表达式太大了？

I would like to use a regular expression to validate user input. I want to allow any combination of letters, numbers, spaces, commas, apostrophes, periods, exclamation marks, and question marks, but I also want to limit the input to 4000 characters. I have come up with the following regular expression to achieve this: I would like to use a regular expression to val