diff --git a/src/Command/Environment/EnvironmentDeleteCommand.php b/src/Command/Environment/EnvironmentDeleteCommand.php
index 2072888960..97502bc1d3 100644
--- a/src/Command/Environment/EnvironmentDeleteCommand.php
+++ b/src/Command/Environment/EnvironmentDeleteCommand.php
@@ -3,6 +3,7 @@
 
 use Platformsh\Cli\Command\CommandBase;
 use Platformsh\Cli\Console\ArrayArgument;
+use Platformsh\Cli\Util\Wildcard;
 use Platformsh\Client\Model\Environment;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
@@ -60,7 +61,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
         if ($specifiedEnvironmentIds) {
             $anythingSpecified = true;
-            $specifiedEnvironmentIds = $this->findEnvironmentIDsByWildcards($environments, $specifiedEnvironmentIds);
+            $allIds = \array_map(function (Environment $e) { return $e->id; }, $environments);
+            $specifiedEnvironmentIds = Wildcard::select($allIds, $specifiedEnvironmentIds);
             $notFound = array_diff($specifiedEnvironmentIds, array_keys($environments));
             if (!empty($notFound)) {
                 // Refresh the environments list if any environment is not found.
@@ -146,7 +148,8 @@ function ($environment) {
         // Exclude environment ID(s) specified in --exclude.
         $excludeIds = ArrayArgument::getOption($input, 'exclude');
         if (!empty($excludeIds)) {
-            $resolved = $this->findEnvironmentIdsByWildcards($selectedEnvironments, $excludeIds);
+            $selectedIds = \array_map(function (Environment $e) { return $e->id; }, $selectedEnvironments);
+            $resolved = Wildcard::select($selectedIds, $excludeIds);
             if (count($resolved)) {
                 $selectedEnvironments = \array_filter($selectedEnvironments, function (Environment $e) use ($resolved) {
                     return !\in_array($e->id, $resolved, true);
@@ -234,25 +237,6 @@ function ($environment) {
         return $success ? 0 : 1;
     }
 
-    /**
-     * Finds environments in a list matching a list of ID wildcards.
-     *
-     * @param Environment[] $environments
-     * @param string[] $wildcards
-     *
-     * @return string[]
-     */
-    private function findEnvironmentIDsByWildcards(array $environments, $wildcards)
-    {
-        $ids = \array_map(function (Environment $e) { return $e->id; }, $environments);
-        $found = [];
-        foreach ($wildcards as $wildcard) {
-            $pattern = '/^' . str_replace('%', '.*', preg_quote($wildcard)) . '$/';
-            $found = array_merge($found, \preg_grep($pattern, $ids));
-        }
-        return \array_unique($found);
-    }
-
     /**
      * @param array $toDeactivate
      * @param array $toDeleteBranch
diff --git a/src/Command/User/UserAddCommand.php b/src/Command/User/UserAddCommand.php
index a6436b728a..00c2d40573 100644
--- a/src/Command/User/UserAddCommand.php
+++ b/src/Command/User/UserAddCommand.php
@@ -810,7 +810,7 @@ private function getSpecifiedEnvironmentRoles(array $roles)
             $role = $this->validateEnvironmentRole($role);
             // Match environment IDs by wildcard.
             if (strpos($id, '%') !== false) {
-                $pattern = '/^' . str_replace('%', '.*', preg_quote($id)) . '$/';
+                $pattern = '/^' . str_replace('%', '.*', preg_quote($id, '/')) . '$/';
                 $matched = preg_grep($pattern, array_keys($environments));
                 if (empty($matched)) {
                     throw new InvalidArgumentException('No environment IDs match: ' . $id);
@@ -856,7 +856,7 @@ private function getSpecifiedEnvironmentTypeRoles(array &$roles)
             $role = $this->validateEnvironmentRole($role);
             // Match type IDs by wildcard.
             if (strpos($id, '%') !== false) {
-                $pattern = '/^' . str_replace('%', '.*', preg_quote($id)) . '$/';
+                $pattern = '/^' . str_replace('%', '.*', preg_quote($id, '/')) . '$/';
                 $matched = preg_grep($pattern, $typeIds);
                 if (empty($matched)) {
                     throw new InvalidArgumentException('No environment type IDs match: ' . $id);
diff --git a/src/Util/Wildcard.php b/src/Util/Wildcard.php
new file mode 100644
index 0000000000..613a11cda2
--- /dev/null
+++ b/src/Util/Wildcard.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Platformsh\Cli\Util;
+
+class Wildcard
+{
+    /**
+     * Selects strings in a list matching a list of wildcards.
+     *
+     * @param string[] $subjects
+     * @param string[] $wildcards
+     *
+     * @return string[]
+     */
+    public static function select(array $subjects, $wildcards)
+    {
+        $found = [];
+        foreach ($wildcards as $wildcard) {
+            $pattern = '/^' . \str_replace('%', '.*', \preg_quote($wildcard, '/')) . '$/';
+            $found = \array_merge($found, \preg_grep($pattern, $subjects));
+        }
+        return \array_unique($found);
+    }
+}
diff --git a/tests/Util/WildcardTest.php b/tests/Util/WildcardTest.php
new file mode 100644
index 0000000000..fb59849a81
--- /dev/null
+++ b/tests/Util/WildcardTest.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Platformsh\Cli\Tests\Util;
+
+use Platformsh\Cli\Util\Wildcard;
+
+class WildcardTest extends \PHPUnit_Framework_TestCase
+{
+    public function testSelect()
+    {
+        $cases = [
+            [['a', 'b', 'c'], ['a'], ['a']],
+            [['foo', 'bar', 'baz'], ['foo'], ['foo']],
+            [['foo', 'bar', 'baz', 'bazz', 'boz'], ['ba%'], ['bar', 'baz', 'bazz']],
+            [
+                ['feature/apple', 'feature/pear', 'feature/banana', 'feature/blueberry'],
+                ['feature/banana'],
+                ['feature/banana'],
+            ],
+            [
+                ['feature/apple', 'feature/pear', 'feature/banana', 'feature/blueberry'],
+                ['f%b%y', 'f%/pear', 'hotfix/%'],
+                ['feature/blueberry', 'feature/pear'],
+            ],
+        ];
+        foreach ($cases as $i => $case) {
+            list($subjects, $wildcards, $result) = $case;
+            $this->assertEquals($result, Wildcard::select($subjects, $wildcards), "Case $i");
+        }
+    }
+}