Largest "separation" of patterns for Delphi regex? - regex

Question

Update
As Graymatter has observed, regex fails to match when there are at least 2 extra line breaks before the second target. That is to say, changing the concatenation loop to "for I := 0 to 1" will make the regex-match fail.
As shown in the code below, without the concatenation, the program can get the two values using regex. However, with the concatenation, the program cannot get the two values.
Could you help to comment on the reason and the workaround ?
program Project1;
{$APPTYPE CONSOLE}
uses
// www.regular-expressions.info/delphi.html
// http://www.regular-expressions.info/download/TPerlRegEx.zip
PerlRegEx,
SysUtils;
procedure Test;
var
Content: UTF8String;
Regex: TPerlRegEx;
GroupIndex: Integer;
I: Integer;
begin
Regex := TPerlRegEx.Create;
Regex.Regex := 'Value1 =\s*(?P<Value1>\d+)\s*.*\s*Value2 =\s*(?P<Value2>\d*\.\d*)';
Content := '';
for I := 0 to 10000000 do
begin
// Uncomment here to see effect
// Content := Content + 'junkjunkjunkjunkjunk' + sLineBreak;
end;
Regex.Subject := 'junkjunkjunkjunkjunk' +
sLineBreak + ' Value1 = 1' +
sLineBreak + 'junkjunkjunkjunkjunk' + Content +
sLineBreak + ' Value2 = 1.23456789' +
sLineBreak + 'junkjunkjunkjunkjunk';
if Regex.Match then
begin
GroupIndex := Regex.NamedGroup('Value1');
Writeln(Regex.Groups[GroupIndex]);
GroupIndex := Regex.NamedGroup('Value2');
Writeln(Regex.Groups[GroupIndex]);
end
else
begin
Writeln('No match');
end;
Regex.Free;
end;
begin
Test;
Readln;
end.

Answer 1

Adding this line works.
Regex.Options := [preSingleLine];
From the documentation:
preSingleLine
Normally, dot (.) matches anything but a newline (\n). With preSingleLine, dot (.) will match anything, including newlines. This allows a multiline string to be regarded as a single entity. Equivalent to Perl's /s modifier. Note that preMultiLine and preSingleLine can be used together.
When there is only one line break before the second target, the regex can match even without preSingleline. The reason is because \s can match line return.