regex

src/mainrevregex.cpp

@@ -0,0 +1,85 @@
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <openssl/aes.h>
+#include <openssl/evp.h>
+#include <string.h>
+#include <string>
+#include <sstream>
+#include <iostream>
+#include <vector>
+#include <syslog.h>
+#include <pthread.h>
+#include <unistd.h>
+
+using namespace std;
+
+
+string revregexn(string str)
+{
+
+	//defines
+	char lnaw='(';
+	char rnaw=')';
+	char lbrak='[';
+	char rbrak=']';
+	char bslash='\\';
+	//
+
+
+	stringstream ss;	
+	std::vector<char> result_vector;
+	std::string::iterator lastcut=str.begin();
+	std::string::iterator iter1;
+	std::string::iterator iter2;
+	string result_string=str;
+
+	for(iter1=str.begin();iter1<str.end();iter1++) // remove () [regex special char.] from  the string
+	{
+		if(*iter1==lnaw && ( (iter1 == str.begin() ) || *(iter1-1)!=bslash))
+		{
+			ss<<str.substr(lastcut - str.begin(),iter1 - str.begin());
+
+			for(iter2=iter1;iter2<str.end();iter2++)
+			{
+				if(*iter2==rnaw && *(iter2-1)!=bslash ){
+					
+					ss<<str.substr(iter1+1 - str.begin(),iter2-2-str.begin());
+					lastcut=iter2;
+					iter1=iter2;
+					break;
+				}
+				//fprintf(stdout,"Regex error %s !! \n",str.c_str());
+			}
+
+		}
+
+	}
+
+	//process results
+
+	if(iter1==str.end())
+	{
+		ss<<str.substr(lastcut +1 - str.begin(),iter1-str.begin());
+		result_string=ss.str();
+
+	}
+
+
+	return result_string;
+}
+
+
+int main(int argc, char **argv)
+{
+
+string s ="1(234)567\n";
+cout<<revregexn(s);
+s ="(1234)5\n";
+cout<<revregexn(s);
+
+return 0;
+
+
+}
+