restrict 1 word as case sensitive and other as case insensitive in python regex | (pipe)

Question

I got the meaning of | (pipe special character) in regex, Python. It matches either 1st or 2nd.

ex : a|b Matches either a or b.

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Answer 1

You could generate the lower/upper case regex for the second word, and keep casing active:

my_regex = "PuNe|"+"".join("[{}{}]".format(x.upper(),x.lower()) for x in "MaHaRaShTrA")

that generates: PuNe|[Mm][Aa][Hh][Aa][Rr][Aa][Ss][Hh][Tt][Rr][Aa]

and re.search(my_regex,s1) without any option does what you want.