Python provides several options that you can use when searching. Of these, the only one that you are likely to use is IGNORECASE:

import re

substring = 'xyz'
search = re.search(substring,'XYZ HOSPITAL',re.IGNORECASE)

Here, IGNORECASE specifies that capitalization is to be ignored when matching: for example, A will match a or A. In this example, xyz can match xyz, XYZ, XyZ, or any combination of uppercase and lowercase letters.

	For a complete list of search options, see the Compilation Flags section of the Regular Expression HOWTO section of the Python documentation.