How to read text from a textbox and make some of them a link?

Question

I will show the problem with a example.

There is some text in the textbox such here:

Hi! this is a example [lnk]text[/lnk]

When i push the submit button and publish this text, the word in the [lnk] and [/lnk] tags must be a link like this www.mysite.com?link=text.

How do I make it easily with javascript or jquery?

Note: I'm not so good about javascript.

Answer 1

This will do the javascript for you - not sure if you need to do anything special for asp.net

<form onsubmit="return doLinks(this.elements['links']);">
<textarea name="links" rows="20" cols="80"></textarea>
<input type="submit">
</form>

<script type="text/javascript">

function doLinks(elm)
{
    var matches = elm.value.match(/\[link\](.*?)\[\/link\]/gi);
    for (var i = 0; i < matches.length; i++)
    {
     var url = 'http://www.mysite.com/?link=' + encodeURIComponent(matches[i].substring(6, matches[i].length - 7));
     elm.value = elm.value.replace(matches[i], url);
    }

    return true;
}

</script>