function containsNumber(str) {

  return str.match(/\d+/) !== null;

}

​

// Example usage

console.log(containsNumber("Hello World")); // Output: false

console.log(containsNumber("Hello123")); // Output: true

str = "hello123!"

if(/\d/.test(str))

  console.log(str+" has a number.")

const str = "vikash123!";

​

const hasNumber = /\d/.test(str);

console.log(hasNumber) // true

function hasNumber(myString) {

  return /\d/.test(myString);

}

// add prefix to classname if a string contains numbers

<div key={uuidv4()} className={header.props && header.props.children?`header ${/\d/.test(header.props.children) ? `time_${header.props.children}`: header.props.children}`: 'header'}>{header}</div>