Question

How to check if a string contain only digits in JavaScript

Answer 1

function is_numeric(s) {
      var only_digits = /^[0-9]+$/;
      if (s.match(only_digits)) {
          return true;
      }
      else {
          return false;
      }
   } 

var s = '2726';
document.write(is_numeric(s));

document.write('<br />');

s = '27f';
document.write(is_numeric(s));

 
 
     
/*
run:
 
true
false 
          
*/

 

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Answer 2

function is_numeric(s) {
      var only_digits = /^\d+$/;
      if (s.match(only_digits)) {
          return true;
      }
      else {
          return false;
      }
   } 

var s = '873a';
document.write(is_numeric(s));

document.write('<br />');

s = '98375';
document.write(is_numeric(s));

 
 
     
/*
run:
 
false
true 
          
*/
  

 

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