i have a file with words door,name,fame,dad,naming and so on.I have a rule file that whenever 'na' is followed by letter m then the letter m should be replaced by letter d and the whole word should be as na+d.so the output should be door,na+de,fame,dad,na+ding.The code below doesnt seems to work.

while(<>) {
    chomp;
    $inp_word4 = $_;
    @inp_word=split(//,$inp_word4);
    for($i=0;$i<@inp_word;$i++)
    {
        if(($inp_word[$i]=~/na/)&&($inp_word[++$i]=~/m/))
{
            $inp_word[++$i]=~s/m/d/;
            }    
            print "$inp_word";

    }

}

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In reply to replace a character based on rule file by lakssreedhar

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