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Regex or Regular Expressions are very useful in Pentesting and Bugbunty; including finding specific patterns in data, extracting sensitive information, and identifying vulnerability patterns. If you learn Regex correctly, you can scan and analyze more accurately.

https://github.com/ziishaned/learn-regex/tree/master
regular and simple tutorials

https://regexone.com/
step by step exercises

https://regexlearn.com/learn
interactive and practical resources

https://regex101.com
https://regexr.com/
https://regexone.com/