$ perl test.pl
sourc: |    abc    abc    abc    abc    abc    |
split: |abc    abc    abc    abc    abc|
regex: |abc    abc    abc    abc    abc|
tr/x/: |abc    abc    abc    abc    abc|
          Rate  rgx  trx splt
rgx  1047602/s   -- -59% -65%
trx  2553722/s 144%   -- -14%
splt 2958598/s 182%  16%   --