Cómo una expresión regular "inocente" rompió Internet y qué se puede hacer para evitarlo/ How an "Innocent" Regular Expression broke the InternetAnd what can be done to prevent it

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In July 2nd 2019, a change was made in a Cloudflare's firewall rule to validate query parameters in URLs. A couple of minutes later, firewalls started failing world wide and reporting a 100% CPU usage, which in turn dropped 80% of requests made to Cloudflare's CDN, breaking a significant portion of the internet for about 20 minutes. The cause? A small regular expression that for most would seem innocent:
.*(?:.*=.*)
Join us and get to know

• Why this incident happened
• Why this regular expression is not as innocent as it seems
• How the outage could have been prevented