Positive & Negative Lookaheads - RegEx Beginner Tutorial
Lookahead assertions in regular expressions come in two types - positive lookaheads and negative lookaheads. 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 lookahead and how to use the negative lookahead.
You can always test your regular expression patterns on a free online regex tester like regex101.com (not sponsored) to check if your lookahead's not working.
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Timestamps:
00:00 - What are Lookaheads in Regular Expressions?
01:02 - Positive Lookahead (?=)
02:33 - Negative Lookahead (?!)
03:20 - Positive Lookahead Visual Studio Demo
04:10 - Claim Your Custom Visual Studio Theme
04:33 - Negative Lookahead Visual Studio Demo
05:10 - Quick Recap
05:34 - What's Next?
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