Regular Expressions in JavaScript - #1 REGEX ULTRA BASICS
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?
1. Validation
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
2.Extraction
Extract parts of a string that we would like to use. Say find how many times someone wrote "david" in a text.
Replacement
Find all parts of the string with "david" and replace them with something else like "devtips".
You will learn:
creating regex in two ways in JavaScript: slash notation or with the constructor new RegExp()
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
https://codepen.io/devtips/pen/gzqKKP
Or try one of these tools to experiment with regexes. They all do basically the same, it's just a matter of taste:
https://www.regexpal.com/
https://www.regexpal.com/
https://regex101.com/
Read more on MDN, it's the best resource:
https://developer.mozilla.org/en-US/d...