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Regexp replace from bracketed ascii number to the corresponding char

Posted on 2014-01-07
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Last Modified: 2014-01-09
I would like to replace a string
"<2>Test<3><13><10>"

to

Chr(2)+"Test"+Chr(3)+Chr(13)+Chr(10)

String length = 1+4+1+1+1 = 8

How can I do this with a RegEx replace? (TRegExReplace in Delphi)
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Question by:lefodnes
3 Comments
 
LVL 17

Assisted Solution

by:Kent Dyer
Kent Dyer earned 50 total points
ID: 39761568
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by:lefodnes
ID: 39761709
Thanks, yes. I would make it using a function, so now I probably need to figure out how to do it for TRegExReplace in Delphi (Pascal).
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LVL 27

Accepted Solution

by:
Sinisa Vuk earned 450 total points
ID: 39766628
whith TRegEx do this:

uses System.RegularExpressions;

function TForm1.ReplaceMyStr(const Match: TMatch): String;
var
  s: String;
  i: Integer;
begin
  Result := '';
  if Match.Success then
  begin
    s := Copy(Match.Value, 2, Match.Length-2); //exclude brackets
    if Length(s) > 0 then
    begin
      if TryStrToInt(s, i) then
        Result := Chr(i);
    end;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  regex: TRegEx;
  input: string;
  myEval: TMatchEvaluator;
begin
  iCC := 0;
  input := '<2>Test<3><13><10>';
  regex.Create('');
  myEval := ReplaceMyStr;
  Label2.Caption := regex.Replace(input, '<[^>]+>', myEval);
end;

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...but maybe can be easier with stringreplace:
s :=  '<2>Test<3><13><10>';
s := StringReplace(s, '<2>', Chr(2), [rfReplaceall]);
s := StringReplace(s, '<3>', Chr(3), [rfReplaceall]);
s := StringReplace(s, '<10>', Chr(10), [rfReplaceall]);
s := StringReplace(s, '<13>', Chr(13), [rfReplaceall]);

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