module for 's/regex/replacement/'style corrections

module for 's/regex/replacement/'style corrections

<DimeCadmium> fffffffffff
<DimeCadmium> s/f/b/
<Erebus> <DimeCadmium> bffffffffff
<DimeCadmium> s/f/b/g
<Erebus> <DimeCadmium> bbbbbbbbbbb
<DimeCadmium> s/f/b/g;
<Erebus> <DimeCadmium> bbbbbbbbbbb
<DimeCadmium> s/f/b/;
<Erebus> <DimeCadmium> bffffffffff
<DimeCadmium> s/a/z/
(note Erebus says nothing because the replacement failed)

<DimeCadmium> abcdef
<DimeCadmium> s/c/z/
<Erebus> <DimeCadmium> abzdef
<DimeCadmium> s/(..).(...)/\1!\2/
<Erebus> <DimeCadmium> ab!def
<DimeCadmium> s!(..).(...)!\1/\2!
<Erebus> <DimeCadmium> ab/def

<DimIRC> ffffffffff
<DimeCadmium> s/f/b/
<Erebus> DimeCadmium: <DimIRC> bfffffffff