Regex captured groups with positive lookbehind (python)

Question

How is it possible to combine a captured group with positive lookbehinds?

I want to match the following examples:

DS
DS,x=y
Some DS,key=value
Some DS test,key=value&key2=value2
Some DS test,key=value&key2=value2|key3=value3

I came up with the following regex for matching everything but the comma:

^(?P<ds_title>[\w \|\-\=\&æøåÆØÅ]+)(?P<filters>[\w \|\-\=\&æøåÆØÅ]+)?$

I've figured out, that the regex I would need to insert is:

(?<=\,)

But I cannot figure out where to insert it. No matter where I insert it, it seems to break. Does anyone know how this can be done correctly?

Answer 1

Aren't you overthinking this?

^(?P<ds_title>[^,]+)(?:,(?P<filters>.+))?$

Why not just allow any string, rather than limiting it to your list?

---

In fact, why use a regex at all?

parts = data.split(',', 2)
if len(parts) == 1:
    title, = parts
else:
    title, filters = parts