George Kalpakas
2292a9cbd9
Previously, the regular expression used by the compiler's ShadowDOM CSS shim to strip comments from CSS text was susceptible to [catastrophic backtracking][1], which could lead to exponential (O(2^n)) increase in complexity/execution time. More specifically, this would be triggered if the processed text contained an unterminated comment with lots of leading whitespace (i.e. `/*`, followed by lots of whitespace characters and no closing `*/`). Although such input is unlikely in real-world scenarios, this commit improves the regular expression to not be susceptible to this issue. [1]: https://www.regular-expressions.info/catastrophic.html PR Close #43456
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