How to match multiple words in regex

Just a simple regex I don't know how to write.

The regex has to make sure a string matches all 3 words. I see how to make it match any of the 3:

/advancedbrain|com_ixxocart|p\=completed/

but I need to make sure that all 3 words are present in the string.

Here are the words

1. advancebrain
2. com_ixxocart
3. p=completed