programming-examples/js/Vre1/Check a given value contains alpha, dash and under.js

function is_alphaDash(str)  
{  
 regexp = /^[a-z0-9_\-]+$/i;  
    
        if (regexp.test(str))  
          {  
            return true;  
          }  
        else  
          {  
            return false;  
          }  
}  
  
console.log(is_alphaDash('12-133'));  
  
console.log(is_alphaDash('100_23'));