支持直接使用RegexSelector进行正则匹配

webmagic-core/src/main/java/us/codecraft/webmagic/selector/AbstractSelectable.java

@@ -84,6 +84,11 @@ public abstract class AbstractSelectable implements Selectable {
         return selectList(regexSelector, getSourceTexts());
     }
     
+    @Override
+    public Selectable regex(RegexSelector selector) {
+        return selectList(selector, getSourceTexts());
+    }
+
     @Override
     public Selectable replace(String regex, String replacement) {
         ReplaceSelector replaceSelector = new ReplaceSelector(regex,replacement);