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Substitute string using location (preferably perl).

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# 1  
Old 07-17-2011
Substitute string using location (preferably perl).
I have a string like.

ATATATATTATTATATTATATTATT

I want to substitute the characters to "C" by using these locations
3 7
10 18
15 20

desired Output:
ATCCCCCTTACCCCCCCCCCTTATT

any clue will be great help. Smilie
thanks in advance.
# 2  
Old 07-17-2011
Assuming that your string is contained in a file:
Code:
perl -pe 'BEGIN{@x=(3,7,10,18,)};for ($i=0;$i<$#x;$i+=2){$_=((substr $_,0,$x[$i]-1)."C"x($x[$i+1]-$x[$i]+1).(substr $_,$x[$i+1]+1))}' file

# 3  
Old 07-18-2011
wrong output.
Output is different from desired one.

ATCCCCCTTACCCCCCCCCCTTATT <= Desired

ATCCCCCTACCCCCCCCCTTATT <= Output

I think in for loop at every step it is keep on reducing a character...

Smilie
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