diff --git i/core/modules/views/src/Plugin/views/filter/NumericFilter.php w/core/modules/views/src/Plugin/views/filter/NumericFilter.php
index e7720df..266ada1 100644
--- i/core/modules/views/src/Plugin/views/filter/NumericFilter.php
+++ w/core/modules/views/src/Plugin/views/filter/NumericFilter.php
@@ -82,7 +82,7 @@ function operators() {
       'regular_expression' => array(
         'title' => $this->t('Regular expression'),
         'short' => $this->t('regex'),
-        'method' => 'op_regex',
+        'method' => 'opRegex',
         'values' => 1,
       ),
     );