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
Regular expressions are case-sensitive by default.
Instances of the regex pattern found in an input string are termed “matches”.