CyberSecurity - RegEx

We all know what RegEx is but do you know it is of immense importance in Cybersecurity domain as well. They are used in multiple subdomains in Cybersecurity, such as the following:

1. To fine tune controls in policy compliance

2. SOC analysts need RegEx for log and malware analysis/detection (YARA Rules)

3. IDS/IPS, firewall and proxy systems use RegEx to specify rules 

Do you know where else RegEx is used in CyberSecurity ? btw, which is your favourite website from where you learned RegEx :)

Happy Learning !!