Good:   $Y=~s/\(/m4vg/g;
Better: $Y=~s s\(sm4vgsggsi;

Good:   $Y =~ s/\)/\(/g ;
Better: $Y =~ s s\)s(sggsi ;

Good:   $Y=~s/m4vg/\)/g;
Better: $Y=~s(m4vg))\))g;