In the JavaScript snippet above, we searched our string for the substring “ello”. The indexOf() method will return a -1 (minus one) value if the given search term was not found inside the string. To learn more about the includes() method, check out JavaScript String includes() Method guide. Tricky because of the case sensitiveness of strings. String search() Method. Removing a specific substring from a string in JavaScript Javascript Web Development Front End Technology Object Oriented Programming We are given a main string and a substring, our job is to create a function, let’s say removeString() that takes in these two arguments and returns a version of the main string which is free of the substring. function getBeforePlus(str){ return str.substring(0, str.indexOf("+")); /* This gets a substring from the beginning of the string to the first index of the character "+". The search value can be string or a regular expression. The following example replaces a substring within a string. JavaScript String - substr() Method. const string = "foo"; const substring = "oo"; console.log(string.includes(substring)); includes doesn’t have Internet Explorer support , though. Find the number of occurrences of a substring within a string. 1) Extracting a substring from the beginning of the string example. Read more about regular expressions in our RegExp Tutorial and our RegExp Object Reference. In Javascript, there is no remove function for string, but there is substr function. */ } Otherwise, I recommend using the String.split() method. Next Page . The function call at the end of the example changes the string Brave New World to Brave New Web. Pre-ES6 alternative to includes(): indexOf() Pre-ES6, the common way to check if a string contains a substring was to use indexOf, which is a string method that return -1 if the string does not contain the substring.If the substring is found, it returns the index of the character that starts the string. Typically includes is the go-to method unless you need to know the index! Let’s take some examples of using the JavaScript substring() method. 3. We did this by using the indexOf() method. Advertisements. We’ve covered the new ES6 String.prototype.includes method and compared it to the previously-favoured String.prototype.indexOf method.. var string = "55+5"; // Just a variable for your input. Description. This method returns -1 if no match is found. It returns -1 if no match is found. The following example uses the substring method to extract a substring starting from the beginning of the string: The search() method searches a string for a specified value, and returns the position of the match. *)j/); alert (test[1]); You can use that like so. This method returns the characters in a string beginning at the specified location through the specified number of characters. Find a substring within a string in javascript. Summary. Syntax. The search value can be a string or a regular expression. You can use the substr function once or twice to remove characters from string. Previous Page. You can make the following function to remove characters at start index to the end of string, just like the c# method first overload String… Playing with string is interesting plus a bit tricky. In this case the desired result is in the second element of the array: var tesst = "afskfsd33j" var test = tesst.match(/a(. The different between the two is includes will return you a Boolean and indexOf will return you a number.. It will replace both individual characters and substrings. The search() method searches the position of the substring in a string and returns the position of the match. In ECMAScript 5 or older environments, use String.prototype.indexOf , which returns -1 when a substring cannot be found: JavaScript substring() examples. 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