Use \Q: 
grep /\Q$var/, @foos;

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See Escape sequences for details.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: matching a variable containing metacharacter treated as character by choroba
in thread matching a variable containing metacharacter treated as character by docdurdee

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