JSFiddle - React, Tailwind, and code Playground

JavaScript

var stringValue = "50, abc";
   var stringArray = stringValue.split(",");
   var age = getMatchingString(stringArray);

       

    function getMatchingString(stringArray, regexPattern)
    {
        for (var i=0; i < stringArray.length; i++)
        {
            if(!isNaN(stringArray[i]))
            {
               return stringArray[i]
            }
        }

        return null;
    }

    alert(age)//50