about string comparision

Hi all,

Thanks in Advance.

I here i have my data in one internal table called g_t_comp. so here i need to attach a screen on which i need to add text boxes.

1) source string

2) destination string

what i need to do is from my data in the internal table. i need to replace the source string with the destination string into my internal table.

FOR EXAMPLE....

i have data in my ITAB like.

govardhan

rajesh

govarrao

rajan

rajasekhar

so

if i give source string as 1)gov

and destination as 2)hello

my ITAB shoul be filled with

helloardhan

rajesh

helloarrao

rajan

this is the situation......

please help me out......