system/Database/MigrationRunner.php
protected function getMigrationName(string $migration): string
	{
		$parts = explode('_', $migration);
		array_shift($parts);

		return implode('_', $parts);
	}
protected function getMigrationName(string $migration): string
	{
		$parts = explode('_', $migration);
		array_shift($parts);

		return implode('_', $parts);
	}
Extracts the migration class name from a filename

@param string $migration

@return string    text portion of a migration filename