drupal_parse_dependency() is now \Drupal\Core\Extension\ModuleHandler::parseDependency()

drupal_parse_dependency() has been moved into the \Drupal\Core\Extension\ModuleHandler::parseDependency() class. The functionality is the same as in Drupal 7.

// Drupal 7
$dependency_info = drupal_parse_dependency('example (>=7.x-2.1)');

// Drupal 8
// This line, like all 'use' statements, belongs at the top of the respective file.
use Drupal\Core\Extension\ModuleHandler;

$dependency_info = ModuleHandler::parseDependency('example (>=8.x-1.3)');