$ perl testSplits.pl
Benchmark: running demsChkSplt, demsChkSplt_o, demsRE, demsRE_o, hisSplit, regex_g, regex_g2, yourRE, each for at least 3 CPU seconds...
demsChkSplt:  3 wallclock secs ( 3.03 usr + -0.01 sys =  3.02 CPU) @ 27103.21/s (n=81933)
demsChkSplt_o:  3 wallclock secs ( 3.02 usr +  0.01 sys =  3.03 CPU) @ 36854.04/s (n=111852)
    demsRE:  3 wallclock secs ( 3.16 usr +  0.00 sys =  3.16 CPU) @ 29056.42/s (n=91673)
  demsRE_o:  4 wallclock secs ( 3.04 usr +  0.00 sys =  3.04 CPU) @ 38914.00/s (n=118104)
  hisSplit:  3 wallclock secs ( 3.07 usr +  0.01 sys =  3.08 CPU) @ 75561.43/s (n=233107)
   regex_g:  4 wallclock secs ( 3.00 usr +  0.00 sys =  3.00 CPU) @ 28482.20/s (n=85589)
  regex_g2:  4 wallclock secs ( 3.09 usr +  0.01 sys =  3.10 CPU) @ 56279.32/s (n=174691)
    yourRE:  3 wallclock secs ( 3.09 usr +  0.01 sys =  3.10 CPU) @ 53248.47/s (n=164804)
                 Rate demsChkSplt regex_g demsRE demsChkSplt_o demsRE_o yourRE regex_g2 hisSplit
demsChkSplt   27103/s          --     -5%    -7%          -26%     -30%   -49%     -52%     -64%
regex_g       28482/s          5%      --    -2%          -23%     -27%   -47%     -49%     -62%
demsRE        29056/s          7%      2%     --          -21%     -25%   -45%     -48%     -62%
demsChkSplt_o 36854/s         36%     29%    27%            --      -5%   -31%     -35%     -51%
demsRE_o      38914/s         44%     37%    34%            6%       --   -27%     -31%     -49%
yourRE        53248/s         96%     87%    83%           44%      37%     --      -5%     -30%
regex_g2      56279/s        108%     98%    94%           53%      45%     6%       --     -26%
hisSplit      75561/s        179%    165%   160%          105%      94%    42%      34%       --