Syntax string.indexOf(searchvalue, start) Parameters

The string indexOf() method is an ES1 feature.

This method cannot search against a regular expression. The string indexOf() method is case-sensitive. It returns the position of the first occurrence of a value (substring) in the string otherwise it returns -1 if the value is not found. The string indexOf() method can be used to check if a string contains a substring or not. This will produce the following result - Contains Point!' 2. Var str = 'Tutorialspoint: Free Video Tutorials' ĭocument.write('Does not contain Point' ) You can try to run the following code to check whether the string “ Tutorialspoint: Free Video Tutorial” contains a substring “point” in or not. SearchValue is a regular expression or a string (will be converted to a regular expression). The string search() method is an ES1 feature. It matches the string against a regular expression and returns the index (position) of the first match. The string search method can be used to search a text (using regular expression) in a string. In this article, we use the following three methods for this purpose. The code example below shows how you can use the indexOf method to check if a string contains a substring in ECMAScript 5 or older.JavaScript provides us with different methods to check whether a string contains a substring or not. } Option 2: Use the indexOf Method (ECMAScript 5 or older) run this code if People is present in the str constant const str = 'We the People of the United States, in Order to form a more perfect Union.' Ĭonsole.log(str.includes('We the')) // trueĬonsole.log(str.includes('Order')) // trueĬonsole.log(str.includes('notpresent')) // falseĬonsole.log(str.includes('WE THE')) // false The code snippet below shows you how to use the includes method to check if a string contains a substring in ECMAScript 6.

Option 1: Use the includes Method (ECMAScript 6) One of the ways is done using the includes method for JavaScript 6 (ECMAScript 6) and the other is with the indexOf for JavaScript 5 (ECMAScript 5) or older. There are two simple ways to check if a string contains a substring in JavaScript.

Javascript if string contains