Regular expressions for judging positive integers

Regular expressions of positive numbers ( Include 0, Keep two decimal places )：^((0{1}\.\d{1,2})|([1-9]\d*\.{1}\d{1,2})|([1-9]+\d*)|0)$

   Regular expressions of positive numbers ( barring 0, Keep two decimal places )：^((0{1}\.\d{1,2})|([1-9]\d*\.{1}\d{1,2})|([1-9]+\d*))$

   Regular expressions for positive integers ( Include 0)：^[+]{0,1}(\d+)$

   Regular expressions for positive integers ( barring 0)：^[1-9]\d*$

  discount （0-1） Regular expressions for decimals ( Include 1)：^(0\.\d+|1)$

  discount （0-1） Regular expressions for decimals ( barring 1)：^(0\.\d+)$

Android Usage method ：

if(" What to verify ".matches(^(0\.\d+|1)$)){
     
         return true;
 }
   

VS Usage method ：

                       var reg = /^(0\.\d+|1)$/g;
                        if (!reg.test(" What to verify ")) {
                            layer.msg(" The content to be verified must be a positive integer or a positive decimal （2 Decimal place ）!", { icon: 5, anim: 6 });
                         
                        }