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To use the test() method, first create a regular expression object using the RegExp constructor. The regular expression can be written using the same syntax as in Java. For example, to check if a string contains only letters and numbers, the regular expression /[a-zA-Z0-9]+/ can be used.
Once the regular expression object is created, the test() method can be called on it, passing in the string to be checked as an argument. The method will return true if the string matches the regular expression, and false otherwise.
Here is an example code snippet that demonstrates how to use the test() method to check if a string matches a regular expression:
const regex = new RegExp(/[a-zA-Z0-9]+/);
const str = "Hello123";
const result = regex.test(str);
console.log(result); // true
In this example, a regular expression object is created using the /[a-zA-Z0-9]+/ regular expression. The string “Hello123” is then passed to the test() method of the regular expression object, which returns true because the string contains only letters and numbers.