Disable / Hide messages shown to end users

Drupal core and the various contributed modules communicates back to the site users using a simple messaging framework that stores all messages into the users session and then outputs them together as $messages in page.tpl.php.

Site owners however do not necessarily like to show all the messages generated by the system. Hacking code to disable the drupal_set_message call is not a recommended approach as you will end up having to maintain a lot of patches just to disable/hide certain messages.

The module Disable Messages does exactly this. It allows site owner to disable specific messages shown to end users. This module gives site administrators a reasonably powerful way to filter out messages shown to the end users.

Features

• Filter out messages that match a full text string exactly.
• Filter out messages that match a regular expression(PCRE).
• Permissions to specifically hide all messages of a given type from any role.
• Disable all filtering for specific users.
• Disable all filtering for specific paths.
• Apply filtering only for specific paths.
• Debug system to get messages in the HTML without showing it to the end users.

Tip: Keep it simple.
Be aware that something that appears very straightforward like:
Notice: Undefined index: field_txt_student_id in ctools_entity_form_field_content_type_render() (line 96 of [...]entity_form_field.inc).
Has a lot more unseen characters in it than one might expect:

<em class="placeholder">Notice</em>: Undefined index: field_txt_student_id in <em class="placeholder">ctools_entity_form_field_content_type_render()</em> (line <em class="placeholder">96</em> of <em class="placeholder">[...]entity_form_field.inc</em>).

So just wrap the meat of the grep with a simple "any character" regex: ".+" as in:

.+Notice.+Undefined index:.+ctools_entity_form_field_content_type_render.+entity_form_field.inc.+

Another simple example
To hide the message Page zzzz has been created use the filter rule:

Page .*? has been created.