diff --git a/dlibrary/dlibrary.py b/dlibrary/dlibrary.py
index 6e65aa6..645e2e4 100755
--- a/dlibrary/dlibrary.py
+++ b/dlibrary/dlibrary.py
@@ -26,10 +26,10 @@ DLSITE_ID_REGEX = re.compile('^[BR]J[0-9]+$')
 FANZA_ID_REGEX = re.compile('^d_[0-9]+$')
 FAKKU_ID_REGEX = re.compile('.*_FAKKU$')
 
-TEXTLESS_REGEX = re.compile('(台詞|セリフ|テキスト|文字)((な|無)し|抜き)|notext|textless')
-EPILOGUE_REGEX = re.compile('after|後日談')
-HI_RES_REGEX = re.compile('高解像度')
-COVER_REGEX = re.compile('表紙|cover')
+TEXTLESS_REGEX = re.compile('(台詞|セリフ|テキスト|文字)((な|無)し|抜き)|notext|textless', re.IGNORECASE)
+EPILOGUE_REGEX = re.compile('after|後日談', re.IGNORECASE)
+HI_RES_REGEX = re.compile('高解像度', re.IGNORECASE)
+COVER_REGEX = re.compile('表紙|cover|hyoushi', re.IGNORECASE)
 ALT_VERSIONS = [
     '褐色',
     '日焼け',