[Python] how to search for multiple substrings in a column using polars

In pandas, I can search for multiple different substrings in a column, and determine which rows they can be found in. How can I do this in polars?

my pandas code:

df = pd.DataFrame({'col1':['a red','dog','liked to play','with his best friend','the CAT']})
ls = ['best','dog']
df[df.col1.str.contains('|'.join(ls))]

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