replace characters of a string in specified position(s) 1

[mikawin]

I want to replace characters in specified positions for a series of strings.

An arbitrary example:

String Input: XXXyRRRtF8
Replace 4th & 8th characters 'y' and 't' with '1' & '2' respectively to give the output: XXX1RRR2F8

Thanks for your help!

~Mika

 

[rharsh]

One way:

$_ = 'XXXyRRRtF8';
substr($_,3,1,1);
substr($_,7,1,2);
print;

Which prints: XXX1RRR2F8