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