$ 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 splt  trx
rgx  1012851/s   -- -42% -52%
splt 1739341/s  72%   -- -17%
trx  2105282/s 108%  21%   --