In Sidebar 14.10 we noted that nonconstant patterns must generally be
recompiled whenever they are used. Perl programmers who wish to reduce the resulting overhead can inhibit recompilation using the o trailing
modifier or the qr quoting operator. Investigate the impact of these mechanisms on performance. Also speculate as to the extent to which it might
be possible for the language implementation to determine, automatically
and efficiently, when recompilation should occur.
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