TRegEx Rio benchmark

[pyscripter 689]

One of the improvements in Delphi Rio is the upgrade of PCRE to version 8.42 and more importantly the inclusion of UTF-16 support on Windows.  What this means is that Delphi strings are no longer converted to UTF-8 and back when using Regular Expressions.  This blog post describes a benchmark of various regular expression options.   I wanted to see the impact of the Rio improvements and here are the results.   The results below use the test suite of the above mentioned article.

 

Delphi 10.2:  Total Time:    12639.00 ms

Delphi 10.3:  Total Time:    10614.00 ms (about 17% faster)

 

Further improvement can be achieved by using PCRE Study.  Fir a bit of extra compile time you have significant execution benefits.  You need a class helper to use Study with TRegEx:

type
  TRegExHelper = record helper for TRegEx
  public
    procedure Study;
  end;

procedure TRegExHelper.Study;
begin
  with Self do FRegEx.Study;
end;

You can call study after TRegEx,Create. Here are the results with Study.

 

Delphi 10.2:  Total Time:    9863.00 ms

Delphi 10.3:  Total Time:   7895.00 ms    (about 20% faster)