Abacre.com

I am having difficulty figuring out batch replace where I need to subtract 1 from a number. 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>

Thanks in advance ...