Browsing Brazilian Portuguese translation

TRANSLATORS: in regexp you can mark some
groups with parentheses. These groups are
then numbered and you can save some of
them in variables. In other programs
those components are often referenced with
back slash, e.g. \1. Compare
sed -e 's,\([a-z][a-z]*\),lowercase=\1,g'
The whole matching component is saved in VARNAME, not its number.