This is a comprehensive guide to checking if a string has a substring in JavaScript.
Using the match() method: This method searches the string for a match against a regular expression, and returns an array containing the matched substrings, or null if no match is found. Using the search() method: This method is similar to indexOf(), but it supports regular expressions, allowing for more advanced substring matching. This method returns a boolean value indicating whether the string contains the substring or not. This method returns the index of the first occurrence of the substring in the string, or -1 if the substring is not found.įor example, let’s check if “word” exists in “Hello world!”: var str = "Hello world!" Here’s a short summary of the most notable ones. There are several ways to check if a JavaScript string contains a substring.
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