Detail and fix RegExp funnel matcher

[wernight]

OWA Version: 1.7.8

PHP Version: 8.2 FPM

Webserver: Nginx

Browser: N/A

Description

Funnels allow using RegExp however there is no proper escaping and the feature should be detailed in the WiKi.

Possible Solution

• First the WiKi should explain that the RegExp matches partial strings (e.g. /foo matches bar/foo). It should also say that it's case-incensitive. More importantly it should explain if and when the steps may also match a RegExp.
• Regarding the escaping, you can see:

  Open-Web-Analytics/modules/base/handlers/conversionHandlers.php

  Lines 344 to 345 in 898236b

  	$pattern = sprintf('@%s@i', $step['url']);
  	$check = preg_match($pattern, $page_uri );

  There it should escape the @ in the RegExp.
• As a feature request, it'd be useful to have a place to put a URL and check which step(s) match it.
• Another bug is the "Watch downstream" button in the funnel which actually does a URI match even when it should do a RegEx match. See

  Open-Web-Analytics/modules/base/reportDomstreams.php

  Line 53 in 898236b

  $doc->getByColumn('uri', $this->getParam('pagePath'));

• Lastly, from the code and a brief testing, I'm not convinced that the funnel works with multiple steps and RegExp:

  Open-Web-Analytics/modules/base/reportGoalFunnel.php

  Line 87 in 898236b

  $operator = '==';

  seem not to care about the match_type.