JSFiddle - React, Tailwind, and code Playground
HTML
<input data-typecast="decimal"/>JavaScript
var mytext ="EXT-12548";
console.log(mytext.toUpperCase())
console.log(mytext.match('^DT-'));
console.log(mytext.match('^EXT-'));
if(mytext.match('^DT-'))
{
console.log('yipee');
}
console.log($("input[data-typecast='decimal'] ").val());