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I need to do a replace where I subtract 1 from a number (or start counting up from 0). I need to change this:

<name>RPT001</name>
<name>RPT002</name>
<name>RPT003</name>
<name>RPT004</name>

to this:

<name>H000</name>
<name>H001</name>
<name>H002</name>
<name>H003</name>

Is this possible with ...