diff --git a/gen-ignores.py b/gen-ignores.py
index e0dae51eac4a7cb40a6a8f11d070f51f72edbac1..cd372f841458ee803955e6b33d757ed497e89952 100755
--- a/gen-ignores.py
+++ b/gen-ignores.py
@@ -20,7 +20,7 @@ for fn in glob.glob(os.path.join(archivebot_ignore_path, '*.json')):
         with open(fn) as fd:
             print('\n\t// %s' % os.path.basename(fn))
             for p in json.load(fd)['patterns']:
-                if re.search(r'\\[0-9]', p) or '(?!' in p:
+                if re.search(r'\\[0-9]', p) or ('(?!' in p) or ('(?=' in p):
                     # RE2 does not support backreferences or other
                     # fancy PCRE constructs. This excludes <10
                     # patterns from the ignore list.
diff --git a/ignore_patterns.go b/ignore_patterns.go
index 319b294823aa7b9327a33e5e8d5a1023a84db675..b44476c8b9f20828059abaf082c5cba77f426043 100644
--- a/ignore_patterns.go
+++ b/ignore_patterns.go
@@ -146,7 +146,6 @@ var defaultIgnorePatterns = []string{
 	"/discover\\?((.*&)?filtertype(_\\d+)?=){2}",
 	"/search-filter\\?(.*&)?filtertype(_\\d+)?=",
 	"/simple-search\\?((.*&)?(filter_type(_\\d+)?|filtertype)=){2}",
-	"/simple-search\\?(?=(.*&)?(filter_type(_\\d+)?|filtertype)=)(.*&)?(author|subject|dateIssued)_page=",
 	"[?&]dateIssued_page=\\d{2,}(&|$)",
 	"[?&]starts_with=",