var myString = 'This is a javascript string. The includes() string method can also be used to find a substring within another string. !!myString.match(subString1) // false Code language: JavaScript ( javascript ) Find a substring with the new includes() method To make it easy to use the results to test whether the substring exists or not, you can use the !! trick to convert the output to a boolean: !!myString.match(subString1) // true MyString.match(subString1) // null Code language: JavaScript ( javascript ) The / and / set the substrings to regular expressions var subString1 = /javascript/ Here is an example: var myString = 'This is a javascript string.' This method is compatible with all current versions of Javascript and very simple to use. Find a substring with a regular expression (regex) The easiest and most compatible method to find a substring within a string in Javascript is to use the match() function with a regular expression. Here are several methods that should work for you. The method takes 2 parameters: start position, and end position (end not included). Enable JavaScript to view data.There are several methods to check if a substring is contained within a string in Javascript. There are 3 methods for extracting a part of a string: slice ( start, end) substring ( start, end) substr ( start, length) JavaScript String slice () slice () extracts a part of a string and returns the extracted part in a new string.

split (splitCommands, 3 ) ) // Specifications SpecificationĮCMAScript Language Specification # īCD tables only load in the browser with JavaScript enabled. ()įunction splitString ( stringToSplit, separator ) const commands = 'light on brightness up brightness up brightness up light on brightness down brightness down light off' Ĭonsole.Object.prototype._lookupSetter_() Deprecated.Object.prototype._lookupGetter_() Deprecated.

Object.prototype._defineSetter_() Deprecated.

Object.prototype._defineGetter_() Deprecated.

Javascript string contains substring