￼Simply put, a regular expression offers a very powerful way to search (and also replace) text and makes the computer do work you’d otherwise have to spend hours doing.
These days regular expressions are supported by most self-respecting text editor software. Unfortunately, many people turn back at the sight of them. They look far more daunting than they actually are. Which is unfortunate as they’re useful for more people than just programmers. Anyone who writes regularly will benefit from understanding how to use them.