Couple of things:
1. if /matchdata/ has any capturing () than $name is pushed into @files for each ().
2. When you do @data = (<LDATA>) you read the entire file into memory. A better way to do this would be:

foreach  (@files)
{
    open(LDATA, "$_") || warn "File does not open: $!\n";
    open(TMP, ">$_.tmp") || warn "File Write problem $_.tmp: $!\n";
    
    while (<LDATA>)
    {
        s/OLD/NEW/gi;
        print TMP $_;
    }
    close(LDATA);
    close(TMP);
    rename("$_.tmp", "$_") or warn "Could not rename '$_.tmp' to '$_':
+ $!\n";
}
[download]

Another side advantage of this is that if, for some reason, your script dies half way through then you still have our old file rather than a half written new file. hth.

$will->code for @food or $$;