Subroutine invocations don't interpolate in double quoted strings (of which m// is a special kind). Either store the results from your function in a scalar and let that interpolate, or use something like /@{[ test_reg1() ]}/ instead.

And an aside, don't use the leading ampersand on subroutine calls; it does things to how the sub is called and unless you specifically have a reason to (and know why you're doing it) you should just omit it.

In reply to Re: Strange behaviour of m and $_ by Fletch
in thread Strange behaviour of m and $_ by Anonymous Monk

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