[R] locate substring in the string it belong to

[kevinchang]

Hi R users,


I am trying generate the indices for locating a in the string it come from.
Given the length of the string, it will take too long using the combn() for
further comparison. I am wondering if R has any built-in function for this
purpose.

To make it concrete:

this.substring="cc"

this.string="ccc" 

start.location=1,2
end.location=2,3 

Thanks in advance, 
Kevin





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