Lookbehind assertions in regular expressions come in two types - positive lookbehinds and negative lookbehinds. They're used similarly in C#, JavaScript, Java, or Python.
These are just two examples of regex assertions, and this beginner tutorial shows you how to use the positive lookbehind and how to use the negative lookbehind.
You can always test your regular expression pattern on a free online regex tester like regex101.com (not sponsored) to check if your lookbehind's not working.
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Other awesome videos worth checking out:
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• Regular Expression (RegEx) Beginner Tutorials
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Timestamps:
00:00 - What are Lookbehinds in Regular Expressions?
01:00 - Positive Lookbehind
01:55 - Negative Lookbehind
02:50 - Positive Lookbehind Visual Studio Demo
04:01 - Claim Your Custom Visual Studio Theme
04:37 - Negative Lookbehind Visual Studio Demo
05:44 - Quick Recap
06:09 - What's Next?
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