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Editorial Team
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Asked: 2026-06-06T20:08:04+00:00

I am using JavaScript’s replace() function to replace a regular expression matching A-Z, a-z,

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I am using JavaScript’s replace() function to replace a regular expression matching A-Z, a-z, 0-9, dash (-), underscore (_) and dot (.). I am trying to replace it with part of the matched string with tags around it, but the code I have only replaces the matches with: <b>$1</b>.

Any help, please?

<!DOCTYPE html>
<html>
<body>

<textarea id="demo" rows="10" cols="20">
<table></table>
<b><i>#stock-jsod.20</i>
</b>
</textarea>

<button onclick="testit()">test</button>

<script type="text/javascript">

function testit()
{
var str=document.getElementById("demo").value;
var n = str.replace(/#([A-Za-z0-9_.-]+)/gi, "<b>$0</b>");
document.getElementById("demo").innerHTML=n;
}
</script>

</body>
</html>

My goal here is to replace #stock-jsod.20 with <b>#stock-jsod.20</b>, but currently it only replaces it with <b>$0</b>.

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1 Answer

  1. Editorial Team

    In addition to Engineer’s answer you also don’t the A-Za-z0-9_. You can just use \w. Then you also don’t need the case insensitive switch. This is a much simpler regular expression that achieves the same effect:

    var n = str.replace(/#[\w.-]+/g, "<b>$&</b>");

    Example output:

    > str = '#abc #def ghi'
"#abc #def ghi"
> str.replace(/#[\w.-]+/g, "<b>$&</b>");
"<b>#abc</b> <b>#def</b> ghi"
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