To do so, we are using the JavaScript function includes(). While we recently checked if a string startsWith or a string endsWith a specific substring, today we will learn how to find out if a string includes another substring. Feel free to share if you found this useful 😃.Lets see how we can determine if a string contains a substring in JavaScript 10 May, 2020 The method returns boolean true if present and false if not.Check if string contians letters const doesItHaveLetter = regex. It can be done like this, // String with some letters const str = '12345hello6789!' Regular expression const regex = // Īt last, we can use the test() method in the regular expression and pass the string as an argument to the method to test if the string contains at least one letter. String with some letters const str = '12345hello6789!' Now let's write the regex by wrapping the sequence range inside regular expression delimiters like this //. Read on 📖.Ĭonsider we have a string with some letters 12345hello6789! like this, // String with some letters const str = '12345hello6789!' To get a more in-depth explanation of the process.

test( '12345hello6789!') // true Advertisement area Check if string contain atleast one letter 🔥 This should be inside a square bracket to define it as a range. The sequence is to match all the small letters from a-z and also the capital letters from A-Z.To check if a string contains at least one letter using regex, you can use the regular expression sequence in JavaScript.

Javascript string contains