JavaScript search

The JavaScript search method is used to find and return the index position of the first occurrence of a specified string in a regular expression. JavaScript search will return -1 if the defined string not found. The syntax of the JavaScript search function is

JavaScript search Example

The following set of examples will help you understand the JavaScript search Function.

The third statement looks for the index position of a substring “Script” and store the index value in Str3. Remember, You should count the space as One Character.

For Str4, we are looking for a non-existing string “abc” inside the Str1. Since JavaScript Search function doesn’t find the substring, it is returning -1 as output

In the next line we are looking for “abc” inside the Str2. From the below JavaScript image you can observe that, term abc is repeated multiple times. However, JS function consider the string “ABC” is different from “abc”.

Now, let us use the i regular expression along with string. This statement performs the case insensitive string search So, it returns the index position of first occurrence i.e., ABC.

<!DOCTYPE html>
    <title> JavaScriptSearch </title>
    <h1> JavaScriptSearch </h1>
  var Str1 = "Learn JavaScript at Tutorial";
  var Str2 = "We are ABC working at abc company";
  var Str3 ="Script");
  var Str4 ="abc"); // Non existing item
  var Str5 ="abc");
  var Str6 =;

  document.write("<b> Index position of Script is:</b> " + Str3);
  document.write("<br \> <b> Index position of abc is:</b> " + Str4);
  document.write("<br \> <b> Index position of abc is:</b> " + Str5);
  document.write("<br \> <b> Index position of abc is:</b> " + Str6);
JavaScript Search