We hope this article helped you to check if a substring is present within a string in javascript. Since the search started from the 18 th position in the second javascript statement, ‘merry’ was not found, and hence -1 got returned as output. It returns true if it finds a match, otherwise, it returns false. search will start from position 18 and return the index of the first occurrence of 'merry' from the entire stringĬonsole.log('We wish you a merry christmas'.indexOf('merry',18)) The test method searches a string for a match with a regular expression. search will start from position 10 and return the index of the first occurrence of 'merry' from the entire stringĬonsole.log('We wish you a merry christmas'.indexOf('merry',10)) Let us see another example with both the arguments passed. Returns: If the substring is found in the specified String, then it returns. Output:- other is not included in string : We wish you a merry christmas The contains() method in Java is used to search the substring in a given String. We will be checking if the substring ‘merry’ is contained in the string ‘We wish you a merry christmas’ let mainString = "We wish you a merry christmas" fromIndexPosition: The indexOf() method will search for the particular substring staring with fromIndexPosition.substringToBeSearched: is the substring to be searched.IndexOf(substringToBeSearched, fromIndexPosition) In Javascript indexOf() method is used to return the index of the first occurrence of specified string within a string object from where it is called. Javascript check if string contains substring using indexOf()
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