Benchmark: timing 100000 iterations of Eval, Regex, Sprintf, SprintfSubst, Sum...
      Eval: 20 wallclock secs (19.58 usr +  0.00 sys = 19.58 CPU)
     Regex:  9 wallclock secs ( 9.97 usr +  0.00 sys =  9.97 CPU)
   Sprintf:  7 wallclock secs ( 6.22 usr +  0.00 sys =  6.22 CPU)
SprintfSubst:  8 wallclock secs ( 8.74 usr +  0.00 sys =  8.74 CPU)
       Sum:  4 wallclock secs ( 3.52 usr +  0.00 sys =  3.52 CPU)