A regular expression (or regex) is way to find strings within strings. It’s small code that when applied to a string, will give other strings – either the whole string or parts of the string. This video gives you the ULTRA BASICS of REGEX.
Regexes most common use cases are:
What can we use them for?
If something is formatted correctly. Like verifying if someone has inputted the correct things in a form like an email address or a postal code
Extract parts of a string that we would like to use. Say find how many times someone wrote “david” in a text.
Find all parts of the string with “david” and replace them with something else like “devtips”.
You will learn:
– escaping the special characters
– the special characters and how they work: ^, $, *, +, [a-z], [0-9], w, d for example
Companion code used in the episode
Or try one of these tools to experiment with regexes. They all do basically the same, it’s just a matter of taste:
Read more on MDN, it’s the best resource: