Commonly used in the development of regular notes.

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1-100 Regular expression :

  var reg = new RegExp("^([1-9]|[1-9]\\d|100)$");
  var a=101;
    if(!reg.test(a)) {
        alert("请输入1-100的整数！")
          
    }

0-100 regular expression:

     var reg = new RegExp("^(\\d|[1-9]\\d|100)$"); 
     var a=101; 
     if(!reg.test(a)) {
          alert("请输入0-100的整数！") 
     }