define regex in javascript code example

Example 1: javascript regex match sequence

// Regular expression match sequence of characters
console.log(/abc/.test("abcde")); // true
console.log(/abc/.test("abxde")); // false

Example 2: javascript regex One or more occurrences of the pattern

// Regular expression 1 or more occurrences of the pattern
console.log(/'\d+'/.test("'123'")); // true
console.log(/'\d+'/.test("''")); // false

let cartoonCrying = /boo+(hoo+)+/i;
console.log(cartoonCrying.test("Boohoooohoohooo"));// true