Parse Russian long-form time ranges

autotests/parsertest.cpp

@@ -315,6 +315,7 @@ private Q_SLOTS:
         T2("Понедельник - Суббота 09:00 - 21:00", "Mo-Sa 09:00-21:00");
         T2("Пон-Пт 08:00-20:00, Суб 08:00-19:00", "Mo-Fr 08:00-20:00, Sa 08:00-19:00");
         T2("Ноябрь-Март", "Nov-Mar");
+        T2("с 08:30 до 23:00", "08:30-23:00");
 
         // recovery from wrong rule separators
         T2("Fr,Sa 10:00-02:00,Su 10:00-20:00", "Fr,Sa 10:00-02:00, Su 10:00-20:00");

src/lib/openinghourslexer.l

@@ -296,7 +296,8 @@ Minggu  { yylval->num = 7; return T_WEEKDAY; }
 、|and|et|e|y|und|& { return T_ADDITIONAL_RULE_SEPARATOR; }
 
   /* skip filler words */
-from|von|du|de|le|das|分|uhr|"en continu" {}
+  /* Note: the 'с' is not an ASCII 'c'! */
+from|von|du|de|le|das|分|uhr|"en continu"|с {}
 
 . {
     //printf("unexpected character: %s at %d:%d\n", yytext, yylloc->first_line, yylloc->first_column);