For that, I have used the same source string as in above examples. In this demo, rather using the hard coded or fixed start and end index numbers, I have given two HTML dropdowns to select the start and end indices.Īs you select the start and end indices and press the button, the JavaScript substring method will execute and return the substring from specified index numbers. That means, if you do not specify the end index number, the substring method will extract the remaining string from the start index.Ī demo of substring with user-selected start and end index numbers Var str_sub = source_string.substring(4) Only this line is changed as compared to the above example: You can see in the output, the remaining string is displayed in the tag after 4 th character. In this example, I will use the same string as in above example while in the substring method only the start index is given. Finally, its value is displayed in the HTML tag. You can see, both starting and end indices are given in the substring method, which returned value is assigned to another variable. See the demo online:Īs you click the button, following JS function is called where substring method is executed: In this example, I have created a source string “The JavaScript substring tutorial!” to demonstrate the substring method.Īs you click the button, “Execute substring method”, it will display the substring extracted from the source string. To understand it better, see the following online examples.Īn example of substring JS method with both parameters (To learn about substr method, go to the last section of this tutorial) If you do not specify the end parameter, then remaining string from begin index will be returned as a substring. The other parameter specifies the end index that tells where to end the substring. This is the required parameter of JavaScript substring method which index starts at zero. You have to specify the start index that represents where to start creating the substring from the source string.

Var sub_string = main_string.substring (5, 30) For example, this is how the substring method can be used: In order to get the substring from a source string, you can use the substring or substr methods of JavaScript.

Substring java negative index