修复规则解析bug

app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt

@@ -451,11 +451,11 @@ class AnalyzeRule(var book: BaseBook? = null) : JsExtensions {
             var tmp: String
             val evalMatcher = evalPattern.matcher(rule)
             while (evalMatcher.find()) {
-                if (mode != Mode.Js) {
-                    mode = Mode.Regex
-                }
                 if (evalMatcher.start() > start) {
                     tmp = rule.substring(start, evalMatcher.start())
+                    if (start == 0 && !tmp.contains("##") && mode != Mode.Js) {
+                        mode = Mode.Regex
+                    }
                     splitRegex(tmp)
                 }
                 tmp = evalMatcher.group()