So, if it is not necessary to maintain the case of a given string, then convert both the sides of the problem to a common format. You can use the substr function once or twice to remove characters from string. It will replace both individual characters and substrings. 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. */ } Otherwise, I recommend using the String.split() method. We did this by using the indexOf() method. Summary. Tricky because of the case sensitiveness of strings. You can use that like so. In ECMAScript 5 or older environments, use String.prototype.indexOf , which returns -1 when a substring cannot be found: const string = "foo"; const substring = "oo"; console.log(string.includes(substring)); includes doesn’t have Internet Explorer support , though. To learn more about the includes() method, check out JavaScript String includes() Method guide. var string = "55+5"; // Just a variable for your input. 3. 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… JavaScript String - substr() Method. Find a substring within a string in javascript. In Javascript, there is no remove function for string, but there is substr function. The default string representation of an array in JavaScript is the elements of the array separated by commas. Description. The function call at the end of the example changes the string Brave New World to Brave New Web. We’ve covered the new ES6 String.prototype.includes method and compared it to the previously-favoured String.prototype.indexOf method.. The different between the two is includes will return you a Boolean and indexOf will return you a number.. The indexOf() method will return a -1 (minus one) value if the given search term was not found inside the string. Typically includes is the go-to method unless you need to know the index! The following example uses the substring method to extract a substring starting from the beginning of the string: In this case the desired result is in the second element of the array: var tesst = "afskfsd33j" var test = tesst.match(/a(. This method returns the characters in a string beginning at the specified location through the specified number of characters. Playing with string is interesting plus a bit tricky. *)j/); alert (test[1]); The search value can be string or a regular expression. The search() method searches a string for a specified value, and returns the position of the match. This method returns -1 if no match is found. Read more about regular expressions in our RegExp Tutorial and our RegExp Object Reference. Find the number of occurrences of a substring within a string. Syntax. 1) Extracting a substring from the beginning of the string example. 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 "+". Previous Page. 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. In the JavaScript snippet above, we searched our string for the substring “ello”. 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