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Eike Decker wrote:

I am trying to find a regular expression that matches each line of an input
string but cannot find an expression that needs no additional checks.

1-st method:
for line in (str.."\n"):gmatch("([^\n]*)\n") do

2-nd method (using split from Lrexlib):
for line in rex.split(str, "\n") do

(various flavors of split can be written in Lua, of course).


--
Shmuel