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Details of the Cloudflare outage on July 2, 2019

(blog.cloudflare.com)
698 points jgrahamc | 1 comments | 12 Jul 19 15:46 UTC | HN request time: 0s | source
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stevens32 ◴[12 Jul 19 23:26 UTC] No.20425422[source]▶
For the regex novices here, would anyone mind explaining what that pattern is meant to match? More specifically, what `.(?:.=.*)` is meant to do?
replies(4): >>20425511 #>>20425513 #>>20425924 #>>20426517 #
1. meowface ◴[12 Jul 19 23:45 UTC] No.20425513[source]▶
The bottom of the post elaborates it.

They said it was for XSS detection. I think the purpose was to identify reflected XSS by looking for paths or headers containing JavaScript-esque variable assignment (JS keywords/syntax preceding "something=something"), but not 100% sure.