Gives: 
Unknown regexp modifier "/g" at (eval 1) line 1, at end of line

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As mentioned elsewhere, g is one of the flags that is a property of the match/substitution operator, not of the regex, and can't be used with qr.
--
A math joke: r = | |csc(θ)|+|sec(θ)| |-| |csc(θ)|-|sec(θ)| |

In reply to Re^2: Use global flag when declaring regular expressions with qr? by ysth
in thread Use global flag when declaring regular expressions with qr? by unmatched

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