Using Regex to replace string in Delphi

Question

From Official documentation of RegularExpressions, the output should be NUMabcabc. But it is not. I wonder what is wrong ?

program Project128;

{$APPTYPE CONSOLE}

uses RegularExpressions;

var Regex: TRegEx;
begin
  Regex := TRegEx.Create('{[0-9]}{[a-c]*}');
  WriteLn(Regex.Replace('3abcabc', 'NUM\1'));
  ReadLn;
end.

I've rolled back your edit. If you want to post an answer containing the correct code, see Can I answer my own question? for information about how to do so properly. Thanks. — Ken White
– Ken White, Commented May 15, 2014 at 16:38

Rudy Velthuis · Accepted Answer · 2014-05-15 17:22:24Z

4

You've got the wrong docs. The docs you reference are for the regex flavour used by IDE search and replace. That flavour of regex is just used by the IDE. The flavour used by the RegularExpressions unit is PCRE, which is quite different and is documented here.

edited May 15, 2014 at 17:22

Rudy Velthuis

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answered May 15, 2014 at 16:13

David Heffernan

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1 Comment

SOUser Over a year ago

Thank you for your help! (I took the comments and link from this SO post stackoverflow.com/questions/20488751 without realizing it is related to IDE ... :D)

Max Kleiner · Accepted Answer · 2024-05-17 18:50:11Z

1

To got the RegEx as the IDE results

 with TRegEx.Create1('([0-9])([a-c]*)') do 
              writeln(Replace('3abcabc', 'NUM\2'));

answered May 17, 2024 at 18:50

Max Kleiner

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