How to create a "bbcode" javascript with replace

This question already has an answer here:

How to replace all occurrences of a string in JavaScript? 41 answers

---

Try

postText.html(postText
              .html()
              .replace(/[tag]/g,'<span class="tag">')
              .replace(/[/tag]/g,'</span>')
              );

Ex:

$('.post').html(function(){
    return $(this)
    .html()
    .replace(/[tag]/g,'<span class="tag">')
    .replace(/[/tag]/g,'</span>')
})

Demo: Fiddle

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