diff --git a/functions.cpp b/functions.cpp
index 40f1b80..c9e0a4c 100644
--- a/functions.cpp
+++ b/functions.cpp
@@ -24,7 +24,7 @@ Curl::~Curl() {
 
 std::string Curl::execute(const std::string &url) {
     std::string source;
-    source.resize(100000);
+    source.reserve(100000);
     curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, static_cast<void*>(&source));
     curl_easy_setopt(curl_handle, CURLOPT_URL, url.c_str());
     auto res = curl_easy_perform(curl_handle);
@@ -35,51 +35,99 @@ std::string Curl::execute(const std::string &url) {
     return source;
 }
 
+bool searchSpecificSeason(const char *const p, size_t &ep_pos, const std::string &number) {
+    size_t cur_pos{};
+    bool found_season{false};
+    while( p[cur_pos] != '\0' ) {
+        if( (p[cur_pos] == 's' || p[cur_pos] == 'S') && isdigit(p[cur_pos+1]) ) {
+            cur_pos++;
+            while( p[cur_pos] == '0' )
+                cur_pos++;
+            size_t offset{};
+            while( offset < number.size() && p[cur_pos + offset] == number[offset] )
+                offset++;
+            cur_pos += offset;
+            if( offset != number.size() )
+                continue;
+            if( (p[cur_pos] == 'e' || p[cur_pos] == 'E') && isdigit(p[cur_pos+1]) ) {
+                found_season = true;
+                ep_pos = cur_pos + 1;
+                break;
+            }
+        }
+        cur_pos++;
+    }
+    return found_season;
+}
+
+bool searchSpecificSeason(const char *const p, const std::string &number) {
+    size_t tmp;
+    return searchSpecificSeason(p, tmp, number);
+}
+
+bool searchSeason(const char *const p, size_t &season_pos) {
+    size_t cur_pos{};
+    bool found_season{false};
+    while( p[cur_pos] != '\0' ) {
+        if( (p[cur_pos] == 's' || p[cur_pos] == 'S') && isdigit(p[cur_pos+1]) ) {
+            cur_pos++;
+            season_pos = cur_pos; // after ++ because we want the first pos to point to season's number
+            while( isdigit(p[cur_pos]) )
+                cur_pos++;
+            if( (p[cur_pos] == 'e' || p[cur_pos] == 'E') && isdigit(p[cur_pos+1]) ) {
+                found_season = true;
+                break;
+            }
+        }
+        cur_pos++;
+    }
+    return found_season;
+}
+
+bool searchSeason(const char *const p) {
+    size_t tmp{};
+    return searchSeason(p, tmp);
+}
+
 void findSeason(std::set<std::string> &files, int season, const std::string &path) {
-    std::smatch match;
-    auto episode = std::regex("[sS][0]{0,2000}" + std::to_string(season) + "[eE][0-9]{1,2000}");
-    for( const auto& p: FSLib::Directory(path) ) {
+    auto number = std::to_string(season);
+
+    for( const auto p: FSLib::Directory(path) ) {
         if(FSLib::isDirectory(path + "/" + p)) {
             findSeason(files, season, path + "/" + p);
             continue;
         }
 
-        if( std::regex_search(p, episode) ) {
+        if( searchSpecificSeason(p, number) )
             files.insert(path + "/" + p);
-        }
     }
 }
 
 void iterateFS(std::set<int> &seasons, const std::string &path) {
-    std::smatch match;
-    auto episode = std::regex("[sS][0-9]{1,2000}[eE][0-9]{1,2000}");
-    for( const auto& p: FSLib::Directory(path) ) {
+    size_t season_pos{std::string::npos}; // season_pos - position of first digit of the season
+    for( const auto p: FSLib::Directory(path) ) {
         if(FSLib::isDirectory(path + "/" + p)) {
             iterateFS(seasons, path + "/" + p);
             continue;
         }
 
-        if( std::regex_search(p, match, episode) ) {
-            std::string a = match[0];
-            a = std::regex_replace(a, std::regex("[eE][0-9]{1,2000}"), "");
-            a = a.substr(1);
-            seasons.insert(std::stoi(a));
-        }
+        if( searchSeason(p, season_pos) )
+            seasons.insert(atoi(p+season_pos));
     }
 }
 
-std::string getDefUrl( const std::string &show, const std::string &language, Curl &c ) {
-    auto search = std::regex_replace(show, std::regex(" "), "+");
-    auto source_code = c.execute("https://www.thetvdb.com/search?q=" + search + "&l=" + language);
+std::string getDefUrl( std::string show, const std::string &language, Curl &c ) {
+    std::replace(show.begin(), show.end(), ' ', '+');
+    auto source_code = c.execute("https://www.thetvdb.com/search?q=" + show + "&l=" + language);
     auto series = std::regex("<td><a href=\"/series.*?</td>");
-    int pos = 1;
+    int pos = 0;
     std::vector<std::string> urls;
     for( std::sregex_iterator it(source_code.begin(), source_code.end(), series); it != std::sregex_iterator(); ++it) {
+        // get show's name from link
         auto input = (*it).str();
         auto text = std::regex_replace(input, std::regex(".*series.*?>"), "");
         text = text.substr(0, text.size() - 9);
-        std::cout << pos << ". " << text << std::endl;
-        pos++;
+        std::cout << ++pos << ". " << text << std::endl;
         urls.push_back(std::regex_replace(input, std::regex("\">.*"), "").substr(13));
     }
     std::cout << "Which TV Show is the right one? ";
diff --git a/functions.hpp b/functions.hpp
index 38bad19..70734fa 100644
--- a/functions.hpp
+++ b/functions.hpp
@@ -14,9 +14,14 @@ private:
     CURL *curl_handle;
 };
 
-std::string getDefUrl( const std::string &show, const std::string &language, Curl &c );
+std::string getDefUrl( std::string show, const std::string &language, Curl &c );
 void findSeason(std::set<std::string> &files, int season, const std::string &path);
 void iterateFS(std::set<int> &seasons, const std::string &path);
 void printHelp();
 
+bool searchSpecificSeason(const char *const p, size_t &ep_pos, const std::string &number);
+bool searchSpecificSeason(const char *const p, const std::string &number);
+bool searchSeason(const char *const p, size_t &season_pos);
+bool searchSeason(const char *const p);
+
 #endif