if i==1 and j==1 then

dlg={
{x=0,y=0,width=1,height=1,class="label",label="Prefix:"},
{x=0,y=1,width=1,height=1,class="label",label="Suffix:"},
{x=1,y=0,width=1,height=1,class="edit",name="pre"},
{x=1,y=1,width=1,height=1,class="edit",name="suf"}
}

pressed,results=aegisub.dialog.display(dlg,{"Go","Cancel"})

if pressed=="Cancel" then aegisub.cancel() end

flags.pre=results.pre
flags.suf=results.suf

end

if i==1 then

text=text:gsub("^(%s*%S)",flags.pre.."%1"..flags.suf)

else
text=text:gsub("^("..("%s*%S"):rep(i-1)..")(%s*%S)",
"%1"..flags.pre.."%2"..flags.suf)

end