Fix and test for bug rrweb-io#1457 (Uncaught SyntaxError: Regular exp…

…ression too large)

 - see test case which is extracted from a real world css file; the selector regex was able to traverse the curly brace as when looking for quotes, it wasn't taking into account that the start quote could be escaped

packages/rrweb-snapshot/src/css.ts

@@ -433,7 +433,7 @@ export function parse(css: string, options: ParserOptions = {}): Stylesheet {
     }
 
     // Use match logic from https://github.com/NxtChg/pieces/blob/3eb39c8287a97632e9347a24f333d52d916bc816/js/css_parser/css_parse.js#L46C1-L47C1
-    const m = match(/^(("(?:\\"|[^"])*"|'(?:\\'|[^'])*'|[^{])+)/);
+    const m = match(/^(((?<!\\)"(?:\\"|[^"])*"|(?<!\\)'(?:\\'|[^'])*'|[^{])+)/);
     if (!m) {
       return;
     }

packages/rrweb-snapshot/test/rebuild.test.ts

@@ -203,4 +203,14 @@ ul li.specified c:hover img, ul li.specified c.\\:hover img {
       expect(getDuration(cachedEnd) * factor).toBeLessThan(getDuration(end));
     });
   });
+
+  it('should not incorrectly interpret escaped quotes', () => {
+    // the ':hover' in the below is a decoy which is not part of the selector,
+    // previously that part was being incorrectly consumed by the selector regex
+    const should_not_modify =
+      ".tailwind :is(.before\\:content-\\[\\'\\'\\])::before { --tw-content: \":hover\"; content: var(--tw-content); }.tailwind :is(.\\[\\&\\>li\\]\\:before\\:content-\\[\\'-\\'\\] > li)::before { color: pink; }";
+    expect(adaptCssForReplay(should_not_modify, cache)).toEqual(
+      should_not_modify,
+    );
+  });
 });