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