Maybe use split

my $string = '/.*uba$/i';
my @f = split '/',$string;
my $qr = ($f[-1] eq 'i') ? qr/$f[1]/i : qr/$f[1]/;

my $cursor = $collection->query( { name=> $qr });

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poj

In reply to Re^3: creating qr from existing regex by poj
in thread creating qr from existing regex by Bobert1234

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