RegExpressions and preUnGreedy

[Jacek Laskowski 57]

I need to enable preUnGreedy option in TRegEx, PCRE supports this parameter:

 

unit System.RegularExpressionsCore;

interface
[...]

type
  TPerlRegExOptions = set of (
    preCaseLess,       // /i -> Case insensitive
    preMultiLine,      // /m -> ^ and $ also match before/after a newline, not just at the beginning and the end of the string
    preSingleLine,     // /s -> Dot matches any character, including \n (newline). Otherwise, it matches anything except \n
    preExtended,       // /x -> Allow regex to contain extra whitespace, newlines and Perl-style comments, all of which will be filtered out
    preAnchored,       // /A -> Successful match can only occur at the start of the subject or right after the previous match
    preUnGreedy,       // Repeat operators (+, *, ?) are not greedy by default (i.e. they try to match the minimum number of characters instead of the maximum)
    preNoAutoCapture   // (group) is a non-capturing group; only named groups capture
  );

But the PCRE parameters are set by mapping:

constructor TRegEx.Create(const Pattern: string; Options: TRegExOptions);
begin
  FOptions := Options;
  FRegEx := TPerlRegEx.Create;
  FRegEx.Options := RegExOptionsToPCREOptions(FOptions);   <--- mapping PCRE params to Delphi TRegEx
  if (roNotEmpty in Options) then
    FRegEx.State := [preNotEmpty];
  FRegEx.RegEx := Pattern;
  FNotifier := TScopeExitNotifier.Create(FRegEx);
  if (roCompiled in FOptions) then
    FRegEx.Compile;
end;

And for a reason unknown to me, this parameter was omitted:
 

function RegExOptionsToPCREOptions(Value: TRegExOptions): TPerlRegExOptions;
begin
  Result := [];
  if (roIgnoreCase in Value) then
    Include(Result, preCaseLess);
  if (roMultiLine in Value) then
    Include(Result, preMultiLine);
  if (roExplicitCapture in Value) then
    Include(Result, preNoAutoCapture);
  if roSingleLine in Value then
    Include(Result, preSingleLine);
  if (roIgnorePatternSpace in Value) then
    Include(Result, preExtended);
end;

Bug?

 

Is there any way to solve this?

 

Delphi 10.3

 

Edited March 23, 2020 by Jacek Laskowski

[pyscripter 694]

See workaround in https://quality.embarcadero.com/browse/RSP-22372.

[stijnsanders 37]

The site is asking me to log in (into Jira??!!) Can you post here what the workaround is?

[pyscripter 694]

See the record helpers in https://github.com/pyscripter/Pcre-Jit-Delphi/blob/master/Demos/benchmark.dpr and the methods SetAdditionalPCREOptions

Edited February 23 by pyscripter