added hint to the regular expression tester

htroot/CrawlStartExpert.html

@@ -308,6 +308,7 @@ <h2>Expert Crawl Start</h2>
             The filter is a <b><a href="http://download.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html" target="_blank">regular expression</a></b>.
             Example: to allow only urls that contain the word 'science', set the must-match filter to '.*science.*'. 
             You can also use an automatic domain-restriction to fully crawl a single domain.
+            Attention: you can test the functionality of your regular expressions using the <a href="/RegexTest.html">Regular Expression Tester</a> within YaCy</a>.
             </span></span>
             <table border="0">
             <tr><td width="110"><img src="env/grafics/plus.gif"> must-match</td><td></td></tr>
@@ -346,6 +347,7 @@ <h2>Expert Crawl Start</h2>
             <span class="info" style="float:right"><img src="env/grafics/i16.gif" width="16" height="16" alt="info"/><span style="right:0px;">
             The filter is a <b><a href="http://download.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html" target="_blank">regular expression</a></b>
             that <b>must not match</b> with the URLs to allow that the content of the url is indexed.
+            Attention: you can test the functionality of your regular expressions using the <a href="/RegexTest.html">Regular Expression Tester</a> within YaCy</a>.
             </span></span>
             <table border="0">
 		    <tr><td width="110"><img src="env/grafics/plus.gif"> must-match</td><td><input name="indexmustmatch" id="indexmustmatch" type="text" size="55" maxlength="100000" value="#[indexmustmatch]#" onblur="if (this.value=='') this.value='.*';"/></td><td>(must not be empty)</td></tr>