Requirement: Get all characters before or after a specified character of a character
Example:
URL = https://www.baid/v2/user/login
(1) Want to get v2 data: v2/user/login
print url[url.rfind('/v2'):](2) Want to get the data before /v2: https://www.baid/
print url[0:url.rfind('/v2')]Author: Syw
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