Use #ifdef instead of #if for EXV_HAVE_REGEX

include/exiv2/version.hpp

@@ -49,7 +49,7 @@
   */
   typedef std::vector<std::regex> exv_grep_keys_t ;
 #else
-# if EXV_HAVE_REGEX
+# ifdef EXV_HAVE_REGEX
 #  include <regex.h>
   /*!
    @brief exv_grep_keys_t is a vector of keys to match to strings

src/actions.cpp

@@ -595,7 +595,7 @@ namespace Action {
             std::smatch m;
             result = std::regex_search(key,m, *g);
 #else
-#if EXV_HAVE_REGEX
+#ifdef EXV_HAVE_REGEX
             result = regexec( &(*g), key.c_str(), 0, NULL, 0) == 0 ;
 #else
             std::string Pattern(g->pattern_);

src/exiv2.cpp

@@ -454,7 +454,7 @@ int Params::evalGrep( const std::string& optarg)
 #if __cplusplus >= CPLUSPLUS11
     greps_.push_back( std::regex(pattern, bIgnoreCase ? std::regex::icase|std::regex::extended : std::regex::extended) );
 #else
-#if EXV_HAVE_REGEX
+#ifdef EXV_HAVE_REGEX
     // try to compile a reg-exp from the input argument and store it in the vector
     const size_t i = greps_.size();
     greps_.resize(i + 1);

src/version.cpp

@@ -177,7 +177,7 @@ static bool shouldOutput(const exv_grep_keys_t& greps,const char* key,const std:
         std::smatch m;
         bPrint = std::regex_search(Key,m,*g) || std::regex_search(value,m,*g);
 #else
-#if EXV_HAVE_REGEX
+#ifdef EXV_HAVE_REGEX
         bPrint = (  0 == regexec( &(*g), key          , 0, NULL, 0)
                  || 0 == regexec( &(*g), value.c_str(), 0, NULL, 0)
                  );