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End of line anchor $ match even there is extra trailing \n in matched string, so we use \Z instead of $
For example
^\w+$ will match the string abcd\n but ^\w+\Z is not
How about \A and when to use?
Most often it’s used when also enabling multi-line matches. Since
\Aonly matches at the beginning of the ENTIRE text, as opposed to just a line beginning, in regexes that can match across lines the functionality of^and\Aare different.