REPLACING CHARACTER STARTING FROM THE RIGHT.

Hey everyone,
The built-in function replace() replaces a character "." starting from left by default.
var txt:String = "2.5.";
if (txt.indexOf(".") == 1) // using (txt.lastIndexOf(".") == 1) does nothing.
txt = txt.replace(".","");
trace(txt); // 25.
There must be a simple method to replace "." starting from the right so that the traced output is "2.5".

"A built-in function would be preferable rather than those RegExp but it works."
I disagree.
One always can build a function. RegExp do wonders - so why overwhelm library with redundant functionality in the main library, especially as far as the top level objects like String are concerned?

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