JS Prototype get element by class?

I got the following code and I'm trying to make it match on a class instead of on an id: Html:
[First Title|http://test.com] Another line [Second Title|http://test.com] More text [Third Title|http://test.com]
Javascript: var textContainer = document.getElementById("testdiv"); var linkText = textContainer.innerHTML; var pattern = /\[([^|]+)\|([^>]+.?)[^<]*(<\/a>)\]/g; var result = linkText.replace(pattern, "$2$1$3"); textContainer.innerHTML = result; Full example: http://jsfiddle.net/JFC72/17/ How can I make it match on "myclass" instead? Thanks!

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