[Python] Giving Hierarchy to a list of Titles

I have this list in python

titles = [
'13.3. Risk',
'13.3.1. Strategy',
'SubStrategy',
'13.3.2. Token',
'Material',
'Impact',
'Aling'
]


And I would like to create hierarchy resulting in something like this:

|_'13.3. Risk'
|____'13.3.1. Strategy'
| |____'SubStrategy'
|____'13.3.2. Token'
|____'Material'
|____'Impact'
|____'Aling'


I have tried regexp, and also the library anytree but I am not getting the desired result. I want to give structure to the list. As a tree or something similar.

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