Basics

Regular expressions are typically formatted as /<rules>/<flags>. Often people will drop the slashes and flags for brevity. We’ll get into the details of flags in a later chapter.

Let’s start with the regex /p/g. For now, please take the g flag for granted.

As we can see, /p/g matches all lowercase p characters.

Instances of the regex pattern found in an input string are termed “matches”.