As you have asked for a "better way": I would try a "filtering" approach. I think it is quite easy to read and to understand:
#!/usr/bin/perl
while(<>) {
next if /\.config$/; # ignore the line if it ends with ".config"
print;
}
As you can see I have used perl code as an example. But I think you get the idea?
added:
this approach could also be used to chain up more filter patterns and it still remains good readable and easy to understand,
next if /\.config$/; # ignore the line if it ends with ".config"
next if /\.ini$/; # ignore the line if it ends with ".ini"
next if /\.reg$/; # ignore the line if it ends with ".reg"
# now we have filtered out all the lines we want to skip
... process only the lines we want to use ...
