Javascript replace()

 

This replace isn't working:

 

var ans = "<math xmlns='http://www.w3.org/1998/Math/MathML' display='block'><mrow><mtext id='carat'>|</mtext></mrow></math>";
ans.replace("<mtext id='carat'>|</mtext>", "<mfrac><mrow><mtext id='carat'>|</mtext></mrow><mrow><mn>3</mn></mrow></mfrac>");

 

Any ideas?

 

Thanks!

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