diff --git a/ch17/README.md b/ch17/README.md
index 568ebaf9..fbea6d8d 100644
--- a/ch17/README.md
+++ b/ch17/README.md
@@ -90,4 +90,22 @@ Because `std::accumulate`'s third parameter is the initial value of the sum. It'
 
 > Write an integral object that contains the correct answers for the true/false quiz. Use it to generate grades on the quiz for the data structure from the previous two exercises.
 
-[Test `QuizResponses` class](ex17_11_quiz_responses_test.cpp)
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+[Test `QuizResponses` class](ex17_11_quiz_responses_test.cpp)
+
+## Exercise 17.14
+
+> Write several regular expressions designed to trigger various errors. Run your program to see what output your compiler generates for each error.
+
+[Try error code 1](ex17_14.cpp)
+
+## Exercise 17.15
+
+> Write a program using the pattern that finds words that violate the “i before e except after c” rule. Have your program prompt the user to supply a word and indicate whether the word is okay or not. Test your program with words that do and do not violate the rule.
+
+[I before E except after C rule](ex17_15.cpp)
+
+## Exercise 17.16
+
+> What would happen if your regex object in the previous program were initialized with "[^c]ei"? Test your program using that pattern to see whether your expectations were correct.
+
+`[^c]ei` says we want any such letter that is followed by the letters 'ei', This pattern describes strings containing exactly **three** characters. The test words in [ex17_15](ex17_15.cpp) will all fail.
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diff --git a/ch17/ex17.14.15.16/main.cpp b/ch17/ex17.14.15.16/main.cpp
deleted file mode 100644
index ebc80d94..00000000
--- a/ch17/ex17.14.15.16/main.cpp
+++ /dev/null
@@ -1,81 +0,0 @@
-/***************************************************************************
- *  @file       main.cpp
- *  @author     Queequeg
- *  @date       19  Nov 2014
- *  @remark     This code is for the exercises from C++ Primer 5th Edition
- *  @note       There are some bugs in gcc(include the latest version 4.9.2) 
- *              to handle regular expression.To compile this program, please
- *			    turn to other compilers such as msvs2013 and clang.
- ***************************************************************************/
-//!
-//! Exercise 17.14
-//! Write several regular expressions designed to trigger various errors.
-//! Run your program to see what output your compiler generates for each error.
-
-//! Exercise 17.15
-//! Write  a program using the pattern that finds word that violate the
-//! "i before e except after c" rule. Have your program prompt the user to
-//! supply a word and indicate whether the word is okay or not. Test your
-//! program with words that do and do not violate the rule.
-
-//! Exercise 17.16
-//! What would happen if your regex object in the previous program were
-//! initialized with "[^c]ei"? Test your program using that pattern to see
-//! whether your expectations were correct.
-
-
-#include <iostream>
-using std::cout;
-using std::cin;
-using std::endl;
-
-#include<string>
-using std::string;
-
-#include <regex>
-using std::regex;
-using std::regex_error;
-
-int main()
-{
-    //! for ex17.14
-    //! error_brack
-    try{
-        regex r("[[:alnum:]+\\.(cpp|cxx|cc)$", regex::icase);
-    }
-    catch(regex_error e)
-    {
-        cout << e.what() << " code: " << e.code() << endl;
-    }
-
-    //! for ex17.15
-    regex r("[[:alpha:]]*[^c]ei[[:alpha:]]*", regex::icase);
-    string s;
-    cout << "Please input a word! Input 'q' to quit!" << endl;
-    while(cin >> s && s != "q")
-    {
-        if(std::regex_match(s, r))
-            cout << "Input word " << s << " is okay!" << endl;
-        else
-            cout << "Input word " << s << " is not okay!" <<endl;
-
-        cout << "Please input a word! Input 'q' to quit!" << endl;
-    }
-
-    cout << endl;
-
-    //! for ex17.16
-    r.assign("[^c]ei", regex::icase);
-    cout << "Please input a word! Input 'q' to quit!" << endl;
-    while(cin >> s && s != "q")
-    {
-        if(std::regex_match(s, r))
-            cout << "Input word " << s << " is okay!" << endl;
-        else
-            cout << "Input word " << s << " is not okay!" <<endl;
-
-        cout << "Please input a word! Input 'q' to quit!" << endl;
-    }
-
-    return 0;
-}
diff --git a/ch17/ex17_14.cpp b/ch17/ex17_14.cpp
new file mode 100644
index 00000000..6feacdf7
--- /dev/null
+++ b/ch17/ex17_14.cpp
@@ -0,0 +1,20 @@
+#include <exception>
+#include <iostream>
+#include <regex>
+#include <string>
+
+using std::regex;
+
+int main()
+{
+    try {
+        regex r("[[:alnum]+\\.(cpp|cxx|cc)$", regex::icase);
+    }
+    catch (std::regex_error e) {
+        std::cout << e.what() << "\ncode:" << e.code() << std::endl;
+    }
+}
+
+// output
+// Unexpected end of character class.
+// code:1
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diff --git a/ch17/ex17_15.cpp b/ch17/ex17_15.cpp
new file mode 100644
index 00000000..dc5a243b
--- /dev/null
+++ b/ch17/ex17_15.cpp
@@ -0,0 +1,38 @@
+#include <exception>
+#include <iostream>
+#include <regex>
+#include <string>
+
+using std::regex;
+
+//! @check https://en.wikipedia.org/wiki/I_before_E_except_after_C
+int main()
+{
+    try {
+        regex r("[[:alpha:]]*(cie|[^c]ei)[[:alpha:]]*");
+        std::string word;
+        while (std::cout << "Enter a word, or q to quit: ", std::cin >> word) {
+            if (word == "q") break;
+            std::smatch result;
+            if (std::regex_search(word, result, r))
+                std::cout << "Violate the rule: 'i before e except after c'"
+                          << std::endl;
+            else
+                std::cout << word + " is okay." << std::endl;
+        }
+    }
+    catch (std::regex_error e) {
+        std::cout << e.what() << "\ncode:" << e.code() << std::endl;
+    }
+}
+
+//! @test
+// Enter a word, or q to quit: believe
+// believe is okay.
+// Enter a word, or q to quit: receive
+// receive is okay.
+// Enter a word, or q to quit: species
+// Violate the rule: 'i before e except after c'
+// Enter a word, or q to quit: seize
+// Violate the rule: 'i before e except after c'
+// Enter a word, or q to quit: q
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