Advertisements. 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. It will replace both individual characters and substrings. The following example replaces a substring within a string. In Javascript, there is no remove function for string, but there is substr function. 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. *)j/); alert (test[1]); 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. 3. Let’s take some examples of using the JavaScript substring() method. */ } Otherwise, I recommend using the String.split() method. The search() method searches a string for a specified value, and returns the position of the match. 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… 1) Extracting a substring from the beginning of the string example. JavaScript String - substr() Method. In ECMAScript 5 or older environments, use String.prototype.indexOf , which returns -1 when a substring cannot be found: We’ve covered the new ES6 String.prototype.includes method and compared it to the previously-favoured String.prototype.indexOf method.. To learn more about the includes() method, check out JavaScript String includes() Method guide. The search value can be a string or a regular expression. const string = "foo"; const substring = "oo"; console.log(string.includes(substring)); includes doesn’t have Internet Explorer support , though. 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() method searches the position of the substring in a string and returns the position of the match. JavaScript substring() examples. Previous Page. Read more about regular expressions in our RegExp Tutorial and our RegExp Object Reference. This method returns -1 if no match is found. You can use that like so. The default string representation of an array in JavaScript is the elements of the array separated by commas. In this case the desired result is in the second element of the array: var tesst = "afskfsd33j" var test = tesst.match(/a(. It returns -1 if no match is found. Next Page . This method returns the characters in a string beginning at the specified location through the specified number of characters. We did this by using the indexOf() method. The following example uses the substring method to extract a substring starting from the beginning of the string: The search value can be string or a regular expression. Syntax. Summary. 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. Playing with string is interesting plus a bit tricky. String search() Method. 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