diff --git a/src/util/regex/regex-backref-matcher.hpp b/src/util/regex/regex-backref-matcher.hpp
index e2eabe8..aa00605 100644
--- a/src/util/regex/regex-backref-matcher.hpp
+++ b/src/util/regex/regex-backref-matcher.hpp
@@ -18,17 +18,17 @@
 {
 public:
   RegexBackrefMatcher(const std::string& expr, shared_ptr<RegexBackrefManager> backRefManager);
-    
+
   virtual ~RegexBackrefMatcher(){}
 
-  void 
+  void
   lateCompile()
   {
     compile();
   }
 
 protected:
-  virtual void 
+  virtual void
   compile();
 };
 
@@ -44,11 +44,11 @@
   // compile();
 }
 
-inline void 
+inline void
 RegexBackrefMatcher::compile()
 {
   int lastIndex = m_expr.size() - 1;
-  if('(' == m_expr[0] && ')' == m_expr[lastIndex]){
+  if ('(' == m_expr[0] && ')' == m_expr[lastIndex]){
     // m_backRefManager->pushRef(this);
 
     shared_ptr<RegexMatcher> matcher(new RegexPatternListMatcher(m_expr.substr(1, lastIndex - 1), m_backrefManager));
@@ -63,5 +63,3 @@
 } // namespace ndn
 
 #endif // NDN_UTIL_REGEX_REGEX_BACKREF_MATCHER_HPP
-
-