diff --git a/src/search.cpp b/src/search.cpp
index 70ce197..1a9c5c8 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -29,6 +29,8 @@
 namespace epubgrep::search
 {
 
+using std::string;
+
 std::vector<match> search(const fs::path &filepath, std::string_view regex,
                           const options &opts)
 {
@@ -68,11 +70,11 @@ std::vector<match> search(const fs::path &filepath, std::string_view regex,
             cleanup_text(document);
         }
 
-        std::string::const_iterator begin{document.begin()};
-        std::string::const_iterator end{document.end()};
-        boost::match_results<std::string::const_iterator> match_result;
-        std::string last_headline;
-        std::string last_page;
+        string::const_iterator begin{document.begin()};
+        string::const_iterator end{document.end()};
+        boost::match_results<string::const_iterator> match_result;
+        string last_headline;
+        string last_page;
 
         while (boost::regex_search(begin, end, match_result, re,
                                    boost::match_default))
@@ -102,13 +104,13 @@ std::vector<match> search(const fs::path &filepath, std::string_view regex,
     return matches;
 }
 
-void cleanup_text(std::string &text)
+void cleanup_text(string &text)
 {
     size_t pos{};
-    while ((pos = text.find('<', pos)) != std::string::npos)
+    while ((pos = text.find('<', pos)) != string::npos)
     {
         // Mark headlines. We need them later on.
-        std::string replacement;
+        string replacement;
         if (boost::regex_match(text.substr(pos, 3), boost::regex{"<[hH][1-6]"}))
         {
             replacement = "<H>";
@@ -135,27 +137,26 @@ void cleanup_text(std::string &text)
     }
 
     pos = 0;
-    while ((pos = text.find('\r', pos)) != std::string::npos)
+    while ((pos = text.find('\r', pos)) != string::npos)
     {
         text.erase(pos, 1);
     }
 
     pos = 0;
-    while ((pos = text.find('\n', pos)) != std::string::npos)
+    while ((pos = text.find('\n', pos)) != string::npos)
     {
         text.replace(pos, 1, " ");
     }
 
     pos = 0;
-    while ((pos = text.find("  ", pos)) != std::string::npos)
+    while ((pos = text.find("  ", pos)) != string::npos)
     {
         text.replace(pos, 2, " ");
     }
 }
 
-match_context
-context(const boost::match_results<std::string::const_iterator> &match,
-        std::uint64_t words)
+match_context context(const boost::match_results<string::const_iterator> &match,
+                      std::uint64_t words)
 {
     if (words == 0)
     {
@@ -174,7 +175,7 @@ context(const boost::match_results<std::string::const_iterator> &match,
         if (pos_before != 0)
         {
             pos_before = prefix.rfind(' ', pos_before);
-            if (pos_before != std::string::npos)
+            if (pos_before != string::npos)
             {
                 --pos_before;
             }
@@ -184,10 +185,10 @@ context(const boost::match_results<std::string::const_iterator> &match,
             }
         }
 
-        if (pos_after != std::string::npos)
+        if (pos_after != string::npos)
         {
             pos_after = suffix.find(' ', pos_after);
-            if (pos_after != std::string::npos)
+            if (pos_after != string::npos)
             {
                 ++pos_after;
             }
@@ -199,7 +200,7 @@ context(const boost::match_results<std::string::const_iterator> &match,
     {
         pos_before += 2;
     }
-    if (pos_after != std::string::npos)
+    if (pos_after != string::npos)
     {
         pos_after -= 1;
     }
@@ -207,25 +208,25 @@ context(const boost::match_results<std::string::const_iterator> &match,
     return {prefix.substr(pos_before), suffix.substr(0, pos_after)};
 }
 
-std::string headline(const std::string_view prefix)
+string headline(const std::string_view prefix)
 {
     size_t pos{prefix.length()};
     while ((pos = prefix.rfind("<H>", pos)) != std::string_view::npos)
     {
         pos += 3;
-        return std::string{prefix.substr(pos, prefix.find('<', pos) - pos)};
+        return string{prefix.substr(pos, prefix.find('<', pos) - pos)};
     }
 
     return {};
 }
 
-std::string page(const std::string_view prefix)
+string page(const std::string_view prefix)
 {
     size_t pos{prefix.length()};
     while ((pos = prefix.rfind("<PAGE ", pos)) != std::string_view::npos)
     {
         pos += 6;
-        return std::string{prefix.substr(pos, prefix.find('>', pos) - pos)};
+        return string{prefix.substr(pos, prefix.find('>', pos) - pos)};
     }
 
     return {};