added a hint about regular expressions in crawl start

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6021 6c8d7289-2bf4-0310-a012-ef5d649a1542

htroot/CrawlStart_p.html

@@ -114,8 +114,9 @@
 			<input type="radio" name="range" value="subpath" />Restrict to sub-path
 		  </td>
           <td>
-            The filter is an emacs-like regular expression that must match with the URLs which are used to be crawled;
-            default is 'catch all'.
+            The filter is a <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/regex/Pattern.html">regular expression</a>
+            that must match with the URLs which are used to be crawled; default is 'catch all'.
+            Example: to allow only urls that contain the word 'science', set the filter to '.*science.*'. 
             You can also use an automatic domain-restriction to fully crawl a single domain.
           </td>
         </tr>