No neg lookbehind (#1493)

* Older versions of Safari 16 don't support lookbehind assertions - https://caniuse.com/js-regexp-lookbehind

* Refactor to show the similarity between these two regexes

* Apply formatting changes

* Create no-neg-lookbehind.md

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Co-authored-by: eoghanmurray <eoghanmurray@users.noreply.github.com>

.changeset/silent-plants-perform.md

@@ -1,5 +1,5 @@
 ---
-'rrweb': patch
+"rrweb": patch
 ---
 
 Return early for child same origin frames