new sed for md to html

bin/generate_html.sh

@@ -23,12 +23,7 @@ for file in ./src/*.md; do
   _TITLE=$(grep -m1 "^# " "$file" | sed -r 's/# //')
 
   # [foo](foo.md) -> [foo](foo.html)
-  #  sed -i -r 's/(\[.*?\])\((.*?)\.md\)/\1(\2.html)/' "$file"
-  # sed does not support non-greedy (.*?) like perl, we have to hack it
-  sed -i -r \
-    -e ':loop' \
-    -e 's/(\[.*\])\((.*)\.md\)/\1(\2.html)/g' \
-    -e 't loop' $file
+  sed -i -E 's/(\[[^)]*\])\((([^.]*\.)*)md\)/\1(\2html)/g' $file
 
   pandoc -s \
     -f gfm+gfm_auto_identifiers-ascii_identifiers \