Don't strip headlines.

man/epubgrep.1.adoc

@@ -72,7 +72,8 @@ epubgrep does not operate on lines, but on whole files. This means you can
 search for text spanning multiple lines. All newlines will be replaced by
 spaces.
 
-HTML will be stripped unless *--raw* is specified.
+HTML will be stripped (except headlines) and newlines will be removed unless
+*--raw* is specified.
 
 === Configuration
 

src/search.cpp

@@ -91,6 +91,11 @@ void cleanup_text(std::string &text)
 {
     for (size_t pos{}; pos != std::string::npos; pos = text.find('<', pos))
     {
+        // Don't strip headlines. We need them later on.
+        if (text[pos + 1] == 'h' || text.substr(pos + 1, 2) == "/h")
+        {
+            continue;
+        }
         text.erase(pos, text.find('>', pos) + 1 - pos);
     }