Python Regex - How to Count the Number of Matches?

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I just wrote a regular expression in Python that matches multiple times in the text and wondered: how to count the number of matches?

Consider the example where you match an arbitrary number of word characters '[a-z]+' in a given sentence 'python is the best programming language in the world'.

How many matches are there in the string? To count the number of matches, you can use multiple methods...

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