txt 2 re
knowing is obsolete :: regular expression generator (perl php python java javascript coldfusion c c++ ruby vb vbscript j# c# c++.net vb.net)
 
 
 
Enter the string that you want to use a regular expression on:
1
   
 
Select the elements that you want to extract to run regular expression generator:
2
4
 4
d4
2
c 
d2
day2
int42
_
c _
ws_
4
c 4
d4
3
c 3
d3
day3
int
< Source String
What to click?  extract any integer in this position
extract this integer (2006) in this position
 
3C++ regular expression program that extracts the selected elements from the entered string:
Perl PHP Python Java Javascript ColdFusion C [C++] Ruby VB VBScript J#.net C#.net C++.net VB.net 
 
// URL that generated this code:
// http://txt2re.com/index-c++.php3?s=42%2043&2&-13&11

#include <stdlib.h>
#include <string>
#include <iostream>
#include <pme.h>

int main()
{
  std::string txt="42 43";

  std::string re1="(4)";	// Any Single Character 1
  std::string re2="(.)";	// Any Single Character 2
  std::string re3=".*?";	// Non-greedy match on filler
  std::string re4="(\\d+)";	// Integer Number 1

  PME re(re1+re2+re3+re4,"gims");
  int n;
  if ((n=re.match(txt))>0)
  {
      std::string c1=re[1].c_str();
      std::string c2=re[2].c_str();
      std::string int1=re[3].c_str();
      std::cout << "("<<c1<<")"<<"("<<c2<<")"<<"("<<int1<<")"<< std::endl;
  }
}

//-----
// C++ does not provide a regular expression feature as standard.
//
// To run this code you will need to first download and install
// the PCRE library from http://www.pcre.org/ and 
// the PME library from ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib/
// 
// Note that on Linux systems PCRE is often already installed in /usr/lib/libpcre* or /usr/local/lib/libpcre*. 
//
// Compile and run on Unix using 
// # c++ x.cpp -lpme -lpcre 
// # ./a.out
// 
 
 
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