Add new Helper to process Ignore Origin rules and RulerZ operator

This commits adds a new helper like RuleBasedTagger for processing
ignore origin rules. It also adds a new custom RulerZ operator for the
'~' pattern matching rule.

Renames 'pattern' with '_all' in IgnoreOriginRule entity.

Signed-off-by: Kevin Decherf <kevin@kdecherf.com>

src/Wallabag/CoreBundle/Operator/PHP/PatternMatches.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Wallabag\CoreBundle\Operator\PHP;
+
+/**
+ * Provides a "~" operator used for ignore origin rules.
+ *
+ * It asserts that a subject matches a given regexp pattern, in a
+ * case-insensitive way.
+ *
+ * This operator will be used to compile ignore origin rules in PHP, usable
+ * directly on Entry objects for instance.
+ * It's registered in RulerZ using a service (wallabag.operator.array.pattern_matches);
+ */
+class PatternMatches
+{
+    public function __invoke($subject, $pattern)
+    {
+        $count = preg_match("`$pattern`i", $subject);
+
+        return \is_int($count) && $count > 0;
+    }
+}