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You can use contains(), indexOf() and lastIndexOf() method to check if one String contains another String in Java or not. If a String contains another String then it's known as a substring. The indexOf() method accepts a String and returns the starting position of the string if it exists, otherwise, it will return -1.
The includes() method returns true if a string contains a specified string. Otherwise it returns false .
Check if a String Has a Certain Text Using the indexOf() Method in TypeScript. The indexOf() method is used to check whether a string contains another string or not.
Here you go: ES5
var test = 'Hello World';
if( test.indexOf('World') >= 0){
// Found world
}
With ES6 best way would be to use includes function to test if the string contains the looking work.
const test = 'Hello World';
if (test.includes('World')) {
// Found world
}
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