JSFiddle - React, Tailwind, and code Playground

by Daedalus

HTML

<textarea class="blah">4</textarea>
<textarea class="blah">44</textarea>
<textarea class="blah"> 4</textarea>
<textarea class="blah"> 44</textarea>
<textarea class="blah">
    44
</textarea>
<textarea class="blah">\0034</textarea>

JavaScript

var entries = document.getElementsByClassName('blah');
for (var i = 0; i<entries.length; i++) {
    var val = entries[i].value;
    console.log(val.match(/^\d+$/),val.toString());   
}