Remove leading zeros of a string in Javascript [duplicate]

Question

I have a scenario where I need to remove any leading zeros from a string like 02-03, 02&03, 02,03. I have this regex( s.replace(/^0+/, ''); ) to remove leading zeros but I need something which works for the above cases.

var s = "01";

s = s.replace(/^0+/, '');

alert(s);

Answer 1

The simplest solution would probably be to use a word boundary (\b) like this:

s.replace(/\b0+/g, '')

This will remove any zeros that are not preceded by Latin letters, decimal digits, underscores. The global (g) flag is used to replace multiple matches (without that it would only replace the first match found).

$("button").click(function() {
  var s = $("input").val();
  
  s = s.replace(/\b0+/g, '');
  
  $("#out").text(s);
});

body { font-family: monospace; }
div { padding: .5em 0; }
#out { font-weight: bold; }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div><input value="02-03, 02&03, 02,03"><button>Go</button></div>
<div>Output: <span id="out"></span></div>

Answer 2

s.replace(/\b0+[1-9]\d*/g, '')

should replace any zeros that are after a word boundary and before a non-zero digit. That is what I think you're looking for here.