RE: [Boost-users] [Help on implementation of boost regex]

2 Aug 2004

      Why don't you use something like

^
Point\(\d+\)\s*=\s*\{\s*\d+\s*,\s*\d+\s*,\s*\d+\s*,\s*\d+(?:\.\d+)?\s*}\s*;
|
Line\(\d+\)\s*=\s*\{\s*\d+\s*,\s*\d+\s*}\s*;
[...add whatever you need here...]
$

And run that for each line. Then you can use the matched method of the match
class to see if a group matched (oh, and set the groups you're interested
for).

----------------------------------
Peace and love,
Tweety
mitea@sympatico.ca - tweety_04_01@users.sourceforge.net
YahooID: tweety_04_01
...
-----Original Message-----
From: boost-users-bounces@lists.boost.org 
[mailto:boost-users-bounces@lists.boost.org] On Behalf Of hackervalley
Sent: August 1, 2004 7:36 PM
To: boost-users@lists.boost.org
Subject: [Boost-users] [Help on implementation of boost regex]
Hello,
I try to use boost regex . I don't have a lot of experience of using
boost regex . Boost regex examples aren't so explicit for me. 
So I need
some help to parse this example file.
Point(1) = {0,0,0,0.1};
Point(2) = {1,0,0,0.1};
Point(3) = {0,1,0,0.1};
Point(4) = {1,1,0,0.1};
Line(1) = {1,2};
Line(2) = {2,4};
Line(3) = {4,3};
Line(4) = {3,1};
Line Loop(5) = {2,3,4,1};
Plane Surface(6) = {5};
I can't read each informations to use it after.
I can't match for use IdentificationNumber of 
Point(IdentificationNumber).
Actually my code look so :
/*
g++ -Wall -O2 -o ifstream ifstream.cc
*/
#include <iostream>
#include <fstream>
#include <string>
/* boost regex header */
#include 
using namespace std;
using namespace boost;
int
main (int argc, char argv[])
{
  char buffer[256];
  string filename;
  string inputstring;
cout << "Input filename ";
  cin >> filename;
  ifstream readfile (filename.c_str (), ios::in);
if (!readfile.is_open ())
  {
      cout << "Error opening file" << endl;
      return 0;
  }
regex exPoint ("Point");
  regex exLine ("Line");
  regex IdentificationNumber ("[:digit:]");
while (!readfile.eof ())
  {
      readfile.getline (buffer, 200);
      inputstring = buffer;
if (regex_search (inputstring, exPoint))
      {
      	cout << "Point" << endl;
      	smatch result;
      	if (regex_search
      	    (inputstring, result, IdentificationNumber))
      	{
      		cout << "Identification Number 
" << result << endl;
      		}
      	else
      		cout << "Error regex_match" << endl;
      }
      if (regex_search (inputstring, exLine))
      {
      	cout << "Line" << endl;
      }
      cout << buffer << endl;
  }
readfile.close ();
return (0);
}
Thank you for help. Best regards
hackervalley
http://hackervalley.free.fr
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