Invalid regular expression for --filter causes PHP Warning

[theseer]

When executing PHPUnit as follows

phpunit --filter */*test*

the specified string gets passed to preg_match but does not compile (which makes sense) but also causes PHPUnit to output PHP Warnings and stack traces:

PHP Warning:  preg_match(): Compilation failed: nothing to repeat at offset 0 in phar:///home/theseer/.phive/phars/phpunit-5.6.5.phar/phpunit/Runner/Filter/Test.php on line 107
PHP Stack trace:
PHP   1. {main}() /home/theseer/.phive/phars/phpunit-5.6.5.phar:0
PHP   2. PHPUnit_TextUI_Command::main() /home/theseer/.phive/phars/phpunit-5.6.5.phar:573
PHP   3. PHPUnit_TextUI_Command->run() phar:///home/theseer/.phive/phars/phpunit-5.6.5.phar/phpunit/TextUI/Command.php:115
PHP   4. PHPUnit_TextUI_TestRunner->doRun() phar:///home/theseer/.phive/phars/phpunit-5.6.5.phar/phpunit/TextUI/Command.php:185
PHP   5. PHPUnit_TextUI_TestRunner->processSuiteFilters() phar:///home/theseer/.phive/phars/phpunit-5.6.5.phar/phpunit/TextUI/TestRunner.php:165
PHP   6. PHPUnit_Framework_TestSuite->injectFilter() phar:///home/theseer/.phive/phars/phpunit-5.6.5.phar/phpunit/TextUI/TestRunner.php:147
PHP   7. PHPUnit_Framework_TestSuite->injectFilter() phar:///home/theseer/.phive/phars/phpunit-5.6.5.phar/phpunit/Framework/TestSuite.php:1018
PHP   8. PHPUnit_Framework_TestSuite->injectFilter() phar:///home/theseer/.phive/phars/phpunit-5.6.5.phar/phpunit/Framework/TestSuite.php:1018
PHP   9. FilterIterator->rewind() phar:///home/theseer/.phive/phars/phpunit-5.6.5.phar/phpunit/Framework/TestSuite.php:1016
PHP  10. PHPUnit_Runner_Filter_Test->accept() phar:///home/theseer/.phive/phars/phpunit-5.6.5.phar/phpunit/Framework/TestSuite.php:1016
PHP  11. preg_match() phar:///home/theseer/.phive/phars/phpunit-5.6.5.phar/phpunit/Runner/Filter/Test.php:107