Check if a string includes "world": lettext ="Hello world, welcome to the universe."; letresult = text.includes("world"); Try it Yourself » More examples below. Description Theincludes()method returnstrueif a string contains a specified string. ...
Javascript search method accepts regular expressions, we can do case insensitive string contains check as shown below. var actualstring = "Javascript search method"; var isContains=actualstring.search("javascript") !== -1; // false actualstring.search(/javascript/i) !== -1; //true ...
InJavaScript String Containsarticle, I have covered how to check a JavaScript string contains another string.JavaScript is not havingcontains()method. Mozilla supportscontains()method 19.0+ onwards. But other browsers don’t support this method. We can useString.indexOf()orString.search()functions ...
string.indexOf(searchString,position)---从position(可选)位置开始,搜索字符串中的第一个searchSting所出现的位置并返回。例如:"hello,jack".indexOf("hello")将返回0; "abcabc".indexOf("a",1)将返回3; string.lastIndexOf(searchString,position)---从position(可选)位置开始,搜索字符串中的最后一个sear...
(1)、JavaScript中的5种原始数据类型:Undefined、Null、Boolean、Number和String。需要注意的是JavaScript中字符串属于原始数据类型。 (2)、typeof运算符用于查看变量类型,对变量或值调用typeof运算符将返回下列值之一: undefined – 如果变量是 Undefined 类型的 ...
JavaScript String charAt() ThecharAt()method returns the character at a specified index (position) in a string: Example lettext ="HELLO WORLD"; letchar= text.charAt(0); Try it Yourself » JavaScript String charCodeAt() ThecharCodeAt()method returns the code of the character at a specified...
Finding a String in a StringThe indexOf() method returns the index of (the position of) the first occurrence of a specified text in a string:Example var str = "Please locate where 'locate' occurs!"; var pos = str.indexOf("locate"); Try it Yourself » The lastIndexOf() method ...
// check if message includes the string "Java" let result = message.includes("Java"); console.log(result); // Output: true Run Code includes() Syntax The syntax of the includes() method is: str.includes(searchString, position) Here, str is a string. includes() Parameters The includes...
The slice() Method The substring() Method Syntax string.substr(start, length) Parameters Parameter Description start Required.The start position.First character is at index 0. If start is greater than the length, substr() returns "".If start is negative, substr() counts from the end of the...
Use the includes() method to search for a substring inside a string: var word = "bravery"; console.log(word.includes(“rave”)); // true Copy Syntax This quick and easy way to check if one string contains another is very simple to implement. Just call the method with the substring ...