Not friendly, but flexible
Tell me what format you need. Writing %04d means generate numbers in the format 0001 - 9999 (four digits with leading zero). Just writing %4d will give numbers like 1 - 9999
This example is helpful. Just some examples allow one to understand better how to use the tool.
I have not understood how to choose the part I want to change, for example if I want to change:
"06/22/08 8:30PM P12345" by "20080622 20:30_Maracaibo" what I have to write in the tool?
JP