How to search for a pattern in a string in JavaScript?

In this article, we will search for a specific pattern and pass only the strings that match the given pattern. We will use the following method to implement this functionality -

Method 1

In this method we will search for the string matching the given pattern and get it from the string. string.search() is a built-in method provided by JavaScript for searching strings. We can also pass a regular expression or a normal string in this method.

Syntax

str.search( expression )

Parameters

• str - Defines the string to be compared.

• Expression - Defines a string expression that will be compared to a string

This will return a string The index where the string has started to match, or "-1" will be returned if the string does not match.

Example 1

In the following example, we compare a string with a regular expression and return its index if the string matches. If not, -1 will be returned.

#index.html

   



   

      Welcome To Tutorials Point
   

   

Output

Example 2

below In the example, we create multiple regular expressions and check whether they meet the requirements on the string.

# index.html

   



   

      Welcome To Tutorials Point
   

   

output

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