Script for Renumbering, Help plz

Hi all
I can't figure out how to do this:

Original Name -> New Name
eb_dn_5_24_2_qsd.wav -> eb_dn_5_48_qsd.wav
eb_dn_5_24_3_qsd.wav -> eb_dn_5_72_qsd.wav

that's to say, they are just 24x2 and 24x3

Is there a way to do this? Thanks in advance

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Try:

var a = item.newBasename.split("_");
return a[0] + "_" + a[1] + "_" + a[2] + "_" + a[3] * a[4] + "_" + a[5];

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Reply to #2:
Thank you very much !!

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