[Django]-How to use regex in django query

As for the first problem you can use the regex operator the Django ORM provides

e.g.

Model.objects.filter(adv_images__regex=r'^\d+')[:3]

Should output the first 3 rows depending on the ordering you have set.

To only select the whole number records the simplest solution is probably

Model.objects.filter(adv_images__regex=r'^\d\.')[:3]

As for the second problem, does the digit represent an unique album identifier, or is your snippet missing a relational field?