exercise 17.17

ch17/ex17.17.18/main.cpp

@@ -0,0 +1,45 @@
+/***************************************************************************
+*  @file       main.cpp
+*  @author     Queequeg
+*  @date       25  Nov 2014
+*  @remark     This code is for the exercises from C++ Primer 5th Edition
+*  @note
+***************************************************************************/
+//!
+//! Exercise 17.17
+//! Update your program so that it finds all the words in an input sequence
+//! that violiate the ¡°ei¡± grammar rule.
+
+//!
+//! Exercise 17.18
+//! Revise your program to ignore words that contain ¡°ei¡± but are not 
+//! misspellings, such as ¡°albeit¡± and ¡°neighbor.¡±
+
+#include <iostream>
+using std::cout;
+using std::cin;
+using std::endl;
+
+#include<string>
+using std::string;
+
+#include <regex>
+using std::regex;
+using std::sregex_iterator;
+
+int main()
+{
+	string s;
+	cout << "Please input a sequence of words:" << endl;
+	getline(cin, s);
+	cout << endl;
+	cout << "Word(s) that violiate the ¡°ei¡± grammar rule:" << endl;
+	string pattern("[^c]ei");
+	pattern = "[[:alpha:]]*" + pattern + "[[:alpha:]]*";
+	regex r(pattern, regex::icase);
+	for (sregex_iterator it(s.begin(), s.end(), r), end_it;
+		it != end_it; ++it)
+		cout << it->str() << endl;
+
+	return 0;
+}