python replace env params in a string which is not a path

Patterns I can receive can vary and I have used

line1 = "$ABC/xyz"
line2 = "123_$ABC_xyz"
line3 = "abc_$XYZ_123_def_$ABC"
line4 = "$XYZ_def_abc"
exp = os.path.expandvars(line)

As I understand expandvars works on line1 and not line2 /line3 So I extracted the pattern with regex --> r"\$([A-Z0-9_]*(?<!_))"

result = re.search(r"(\$([A-Z0-9_]*(?<!_)))", line2)
print (result.group(2))

Problem : How do I pass the variable to os.environ(), as this doesn't seem to accept any variables only strings. I tried even envsubst which also is not working.

And for line3, there are more than one env param i want to replace. Is there any python package which will do the replacement which i can use or do I need to use a recursive call to a function I write?

Any inputs for this would be of great help. Please do let me know if I need to provide any more details.

Expected Ouput: os.environ['ABC'] = 'WSS' os.environ['XYZ'] = 'OK'

line1 = "WSS/xyz"
line2 = "123_WSS_xyz"
line3 = "abc_OK_123_def_WSS"
line4 = "OK_def_abc"

source https://stackoverflow.com/questions/72232906/python-replace-env-params-in-a-string-which-is-not-a-path

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