Positive & Negative Lookbehinds - RegEx Beginner Tutorial

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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.

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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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