Challenge Sift Through Text With Regular Expressions - ashish9342/FreeCodeCamp GitHub Wiki
Regular expressions
are used to find certain words or patterns inside of strings.
Regular expressions are usually surrounded by /
symbols.
For example, if we wanted to find the number of times the word the occurred in the string The dog chased the cat, we could use the following regular expression: /the+/gi
Let's break this down a bit:
the is the pattern we want to match.
-
+
means we want to find one or more occurrences of this pattern. -
g
means that we want to search the entire string for this pattern. -
i
means that we want to ignore the case (uppercase or lowercase) when searching for the pattern.