First attempt at addressing #8008

When filter exression is not a valid regexp, send
it as a regular text filer.

(cherry picked from commit a93ad3b)
(cherry picked from commit e3f3cd9)

Author: michaelklishin

deps/rabbitmq_management/priv/www/js/global.js

@@ -490,8 +490,7 @@ var HELP = {
 
     'filter-regex' :
     'Whether to enable regular expression matching. Both string literals \
-    and regular expressions are matched in a case-insensitive manner.<br/><br/> \
-    (<a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions" target="_blank">Regular expression reference</a>)',
+    and regular expressions are matched in a case-insensitive manner.<br/><br/>',
 
     'consumer-active' :
     'Whether the consumer is active or not, i.e. whether the consumer can get messages from the queue. \
@@ -501,7 +500,7 @@ var HELP = {
     (<a href="https://www.rabbitmq.com/consumers.html#active-consumer" target="_blank">Documentation</a>)',
 
     'consumer-owner' :
-    '<a href="https://www.rabbitmq.com/consumers.html">AMQP consumers</a> belong to an AMQP channel, \
+    '<a href="https://www.rabbitmq.com/consumers.html">AMQP 0-9-1 consumers</a> belong to a channel, \
     and <a href="https://www.rabbitmq.com/stream.html">stream consumers</a> belong to a stream connection.',
 
     'plugins' :

deps/rabbitmq_management/priv/www/js/main.js

@@ -253,7 +253,9 @@ function set_timer_interval(interval) {
 }
 
 function reset_timer() {
-    clearInterval(timer);
+    if (timer != null) {
+        clearInterval(timer);
+    }
     if (timer_interval != null) {
         timer = setInterval(partial_update, timer_interval);
     }
@@ -733,12 +735,27 @@ function postprocess() {
     update_multifields();
 }
 
+function is_valid_regexp(value) {
+    try {
+        var _ = new RegExp(value, 'i');
+        return true;
+    } catch (e) {
+        return false;
+    }
+}
+
 function url_pagination_template_context(template, context, defaultPage, defaultPageSize){
     var page_number_request = fmt_page_number_request(context, defaultPage);
     var page_size = fmt_page_size_request(context, defaultPageSize);
     var name_request = fmt_filter_name_request(context, "");
     var use_regex = fmt_regex_request(context, "") == "checked";
-    if (use_regex) {
+    // rabbitmq/rabbitmq-server#8008: if the expression cannot be compiled to a reg exp,
+    // assume a regular text filter
+    var valid_regexp = is_valid_regexp(name_request);
+    if (!valid_regexp) {
+        use_regex = false;
+    }
+    if (use_regex && valid_regexp) {
         name_request = esc(name_request);
     }
     return  '/' + template +