Ignore patterns with unsupported Perl regex constructs

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.

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=",