documentclass{article}
usepackage{polyglossia}
setdefaultlanguage[calendar=gregorian,hijricorrection=1,locale=mashriq]{arabic}
setmainfont[Script=Arabic,Extension=.ttf]{Amiri-Regular}
begin{document}
Bonjourspecial{ligne x}
begin{Arabic}يانيسend{Arabic}
Bonjour
end{document}

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