1 var test = " \n "; 2 //var test = " "; 3 if(test.match(/^\s+$/)){ 4 console.log("all space or \\n") 5 } 6 if(test.match(/^[ ]+$/)){ 7 console.log("all space") 8 } 9 if(test.match(/^[ ]*$/)){ 10 console.log("all space or empty") 11 } 12 if(test.match(/^\s*$/)){ 13 console.log("all space or \\n or empty") 14 }