search for: 1_field2ndtry_0000

...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 [[alternative HTML version deleted]]