![]() ![]() var myString = 'This is a javascript string. The includes() string method can also be used to find a substring within another string. You can prevent case-related errors by converting the string and the target substring to the same case before comparing them. The method is case-sensitive and returns a boolean: a true value denotes a matching substring in the array. If the returned value is not equal to -1, the string contains the substring. Neither function supports regular expressions. You can check if a JavaScript string contains a substring using the includes () method. To check if a string contains a substring in JavaScript: Call the String.indexOf () method on the given string, passing it to the substring as a parameter. !!myString.match(subString1) // false Code language: JavaScript ( javascript ) Find a substring with the new includes() method Both Stringincludes() and StringindexOf() are case sensitive. 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.' The substring () method returns the part of the string from the start index up to and excluding the end index, or to the end of the string if no end index is supplied. 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. To check if a string contains substring or not, use the Javascript match method. Here are several methods that should work for you. ![]() There are several methods to check if a substring is contained within a string in Javascript. ![]()
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