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Retrieve specific text from TString

Posted on 2014-04-08
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Last Modified: 2014-04-09
Hi,

What I want to do is to retrieve f.e. the name and date stored somewhere within a TString based on the preceding text.

Dear mister Long,

Client name: Sally Field
Date: 23/03/2014

With kind regards,

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In this example a function would:
- Search for string "Client name: "
- If found, the function will return "Sally Field" (whole text after the searchstring)
- Search for string "Date: "
- If found, the function will return "23/03/2014" (whole text after the searchstring)

How can this be done?
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Question by:Delphiwizard
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5 Comments
 
LVL 19

Expert Comment

by:Thommy
ID: 39986187
Try this...
function GetClientName(s:string):string;
var
  p: integer;
begin
  result:='';
  p:=pos('Client Name:',s);
  if p>0 then
    result:=Trim(Copy(s,p+Length('Client Name:'),Length(s)));
end;

function GetDate(s:string):string;
var
  p: integer;
begin
  result:='';
  p:=pos('Date:',s);
  if p>0 then
    result:=Trim(Copy(s,p+Length('Date:'),Length(s)));
end;

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0
 
LVL 19

Expert Comment

by:Thommy
ID: 39986225
Or use one universal function...
function GetValueAfterPrecText(s:string;PrecText:string):string;
var
  p: integer;
begin
  result:='';
  p:=pos(PrecText,s);
  if p>0 then
    result:=Trim(Copy(s,p+Length(PrecText),Length(s)));
end;

...

s:=GetValueAfterPrecText('Client name: Sally Field','Client Name:'); //returns "Sally Field"
s:=GetValueAfterPrecText('Date: 23/03/2014'          ,'Date:');              //returns "23/03/2014"

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0
 

Author Comment

by:Delphiwizard
ID: 39986653
The function does position at the correct startingpoint, but it gets everything that comes after the search-text.
Dear mister Long,

Client name: Sally Field
Date: 23/03/2014

With kind regards,

Open in new window

In my example the GetValueAfterPrecText(MyText,'Client name: '); will return
Sally Field
Date: 23/03/2014

With kind regards,

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It should only give me the text on the same line. In this case "Sally Field".
It should stop at the point of a hard of soft line-break.
0
 
LVL 19

Accepted Solution

by:
Thommy earned 2000 total points
ID: 39987984
I already wondered, but you said, you wanted the "whole text after the searchstring" and did not make any mention of line breaks!!!

Ok, then you have to search for the line breaks.
So this is your code...

function GetValueAfterPrecText(s:string;PrecText:string):string;
var
  p: integer;
begin
  result:='';
  s := StringReplace(s, #13, '', [rfReplaceAll]);

  p:=pos(PrecText,s);
  if p>0 then begin
    s:=Copy(s,p+Length(PrecText),Length(s));
    p:=pos(#10,s);
    if p>0 then begin
      result:=Trim(Copy(s,1,p-1));
    end;
  end;
end;

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0
 

Author Closing Comment

by:Delphiwizard
ID: 39988099
Perfect, thank you.
0

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