system/Validation/FormatRules.php
public function alpha_space(string $value = null): bool
	{
		if ($value === null)
		{
			return true;
		}

		return (bool) preg_match('/^[A-Z ]+$/i', $value);
	}
public function alpha_space(string $value = null): bool
	{
		if ($value === null)
		{
			return true;
		}

		return (bool) preg_match('/^[A-Z ]+$/i', $value);
	}
Alpha with spaces.

@param string $value Value.

@return boolean True if alpha with spaces, else false.