Fix issue with failed service

Failed services may contain non valid character in
front of there service name. This commit improves
the regex to extract the service name.

Author: Andreas Frömer

src/Utils/OutputFetcher.php

@@ -19,7 +19,7 @@ class OutputFetcher
      */
     public static function fetchUnitNames(string $suffix, string $output): array
     {
-        preg_match_all('/^\s*(?<unit>.*)\.' . $suffix . '\s.*$/m', $output, $matches);
+        preg_match_all('/^[^[:alnum:]-_\.@]*(?<unit>.*)\.' . $suffix . '\s.*$/m', $output, $matches);
         return $matches['unit'] ?? [];
     }
 }

tests/Integration/SystemCtlTest.php

@@ -45,6 +45,7 @@ public function testListUnitsWithAvailableUnits()
   beanstalkd.service                                 loaded active running
   console-setup.service                              loaded active exited
   cron.service                                       loaded active running
+● [email protected]                       loaded failed failed
 EOT;
 
         $command = $this->prophesize(CommandInterface::class);
@@ -57,7 +58,7 @@ public function testListUnitsWithAvailableUnits()
         $systemctl->setCommandDispatcher($dispatcherStub->reveal());
 
         $units = $systemctl->listUnits(null, SystemCtl::AVAILABLE_UNITS);
-        $this->assertCount(11, $units);
+        $this->assertCount(12, $units);
     }
 
     public function testListUnitsWithSupportedUnits()

tests/Unit/Utils/OutputFetcherTest.php

@@ -35,21 +35,22 @@ public function itDeterminesTheCorrectAmountOfUnits(
     public function itDeterminesTheCorrectAmountOfUnitsDataProvider(): array
     {
         $output = <<<OUTPUT
-  superservice.service      Active running
-  awesomeservice.service    Active running
-  nonservice.timer          Active running
-  superservice.mount        Active running
-  awesomeservice.mount      Active running
-  nonservice.timer          Active running
-  superservice.service      Active running
-  awesomeservice.service    Active running
+  superservice.service         active running
+  awesomeservice.service       active running
+  nonservice.timer             active running
+  superservice.mount           active running
+  awesomeservice.mount         active running
+  nonservice.timer             active running
+  superservice.service         active running
+  awesomeservice.service       active running
+● [email protected]   loaded failed failed  
 OUTPUT;
 
         return [
             [
                 'output' => $output,
                 'suffix' => 'service',
-                'amount' => 4,
+                'amount' => 5,
             ],
             [
                 'output' => $output,
@@ -97,6 +98,7 @@ public function itOnlyExtractsTheUnitNamesDataProvider(): array
   nonservice.timer          Active running
   [email protected]      Active running
   [email protected]    Active running
+● [email protected] loaded failed failed  
 OUTPUT;
 
         return [
@@ -108,6 +110,7 @@ public function itOnlyExtractsTheUnitNamesDataProvider(): array
                     'foo-bar',
                     'instance-service@1',
                     'instance-service@foo',
+                    'failed-service@foo'
                 ],
             ],
             [