The .indexOf() function returns a number indicating the index of a substring in a given string. (2) indexOf(String subString,Integer intFromIndex) - It is use for get index of string/character from the specified from index. In case of fixed length of desired substring I would use substr() with negative argument for its short and readable syntax "xxx_456".substr(-3) For now it is compatible with … If the substring is not present, then it will return-1.. Description. If that substring is not available in the string, the returned index would be -1. Next Page . JavaScript 참고자료 ... 왜냐하면, indexOf() 메서드는 대소문자를 구분하기 때문에 myCapString에서 "cheddar" 문자열을 찾을 수 없기 때문입니다. indexOf() method will return the position of the first occurrence of the mentioned text, that is, 7. lastIndexOf() This JavaScript String function will search and return the index of the last occurrence of a mentioned character or substring within the string. Syntax. If it is not found, it returns -1. var myString = 'brie, ... String.prototype.substr() String.prototype.substring() String.prototype.sup() For example (Stack Overflow. JavaScript Check if String Contains: indexOf() The JavaScript indexOf() method, like includes(), checks if a string includes another string. Internal implementation JavaScript String - indexOf() Method. Java String indexOf() The java string indexOf() method returns index of given character value or substring. What is different is the output from these two functions. Note : The first two methods shown below also works on arrays, which tells you if an array contains a given value (or the index of it for indexOf() ). JavaScript. JavaScript indexOf substring In this section, we are going to find the location of substring using the JavaScript method indexOf() . So you can use JavaScript IndexOf() method to check if a string contains substring in it. When this method is called from the string object, it returns the index of the position where the specified string first occurs in a string. The solution looks like below. For older browser support (IE) Old browser like the Internet Explorer does not support the includes property. The index counter starts from zero. indexOf() returns the starting index location of the substring. Advertisements. This method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex or -1 if the value is not found. If substring not found, it returns -1. ... word = word.substring(word.indexOf("Foo")); You may need a +/- 1 after the indexOf() to adjust the start/end of the string. Example: If you want to get index of "@" from "MyNew@Car" with from index of "2" When we use the includes() method, the method returns a boolean: true or false. 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