$re = '/^.*\\\\bin\\\\.*\\\\.*[Tt]ests\.dll$/m';
$str = 'C:\\ProjectFolder\\TestProject\\TestProject.API.Manager.Tests\\bin\\Debug\\TestProject.API.Manager.Tests.dll C:\\ProjectFolder\\TestProject\\TestProject.API.Manager.Tests\\bin\\Release\\TestProject.API.Manager.Tests.dll
C:\\ProjectFolder\\TestProject\\TestProject.API.Manager.UnitTests\\bin\\Debug\\TestProject.API.Manager.UnitTests.dll C:\\ProjectFolder\\TestProject\\TestProject.API.Manager.UnitTests\\bin\\Release\\TestProject.API.Manager.UnitTests.dll
C:\\ProjectFolder\\TestProject\\TestProject.API.Manager.Tests\\bin\\debug\\TestProject.API.Manager.Tests.dll C:\\ProjectFolder\\TestProject\\TestProject.API.Manager.Tests\\bin\\release\\TestProject.API.Manager.tests.dll
C:\\ProjectFolder\\TestProject\\TestProject.API.Manager.UnitTests\\bin\\debug\\TestProject.API.Manager.UnitTests.dll C:\\ProjectFolder\\TestProject\\TestProject.API.Manager.UnitTests\\bin\\release\\TestProject.API.Manager.unittests.dll
C:\\ProjectFolder\\TestProject\\TestProject.API.Manager.Tests\\bin\\Debug\\SomeProject.dll';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php