Regular Expressions in GAMS/IDE

I had to add a ';' to each line in a file. In vi (unix editor) one would do:

1,$s/$/;/

In the GAMS IDE this works slightly different:

replace: .*$
by: $0;

As an aside: the equivalent of 1,$s/^/;/ is not obvious to me (there may be an issue here if we use ;$0 as replacement string).