Dear all,
I would like to search in a string for the second occurrence of a symbol and replace the symbol after it

For example my strings look like

sta_+1+0_field2ndtry_0000$01.cfg

I want to find the digit that comes after the second +, in that case is zero
and then over a loop create the strings below

sta_+1+0_field2ndtry_0000$01.cfg

sta_+1+1_field2ndtry_0000$01.cfg

sta_+1+2_field2ndtry_0000$01.cfg

sta_+1+3_field2ndtry_0000$01.cfg

and so on..
I have already tried strsplit but this will make things more complex... 

Could you please help me with that?

B.R
Alex

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