programming-examples/js/Vre1/Check whether a given value is time string or not.js

function is_timeString(str)  
{  
 regexp = /^(2[0-3]|[01]?[0-9]):([0-5]?[0-9]):([0-5]?[0-9])$/;  
    
        if (regexp.test(str))  
          {  
            return true;  
          }  
        else  
          {  
            return false;  
          }  
}  
  
console.log(is_timeString("11:35:30"));  
  
console.log(is_timeString("90:90:90"));