JavaScript - String match() method example

// ONLINE-RUNNER:browser;

const expression = /\s/g; // match whitespaces

const text = 'Example text.';

if (text.match(expression)) {
    console.log('The string contains space(s).');
}

1. Documentation

2. More examples

In this example, we use the match() method to return an array of digits from the text string. 

// ONLINE-RUNNER:browser;

const expression = /[0-9]/g; // match digits (0...9)

const text = 'Example number: 1234';
const digits = text.match(expression);

console.log(digits);

Output:

[ '1', '2', '3', '4' ]

See also

1. JavaScript - exec() vs match()

References

1. String.prototype.match() - JavaScript | MDN