Is there a grep-ish/search tool that'll automatically treat "This is a sentence" as "This\w+is\w+a\w+sentence", where \w is a unicode category for "all white and blank space including all forms of new lines"?

I feel like there's an option on grep or ripgrep or something I'm just... not catching on. I'm having a hard time searching documents in their raw form where there are arbitrary linebreaks in text for 80 column history reasons.