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For example, I would like to count how many numbers are in a string using a regex like: [0-9]
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This method, added in Java 9, returns a sequential stream of match results, allowing us to count the matches more easily: long count = countEmailMatcher. results() . count(); assertEquals(3, count);
The len() is used to return total count of match. The enumerate function can be used to produce the key value pair for the list being it's index and value and we can store them using list comprehension. The len() is used to return total count of match.
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "." ; regex \+ matches "+" ; and regex \( matches "(" . You also need to use regex \\ to match "\" (back-slash).
To check the length of a string, a simple approach is to test against a regular expression that starts at the very beginning with a ^ and includes every character until the end by finishing with a $.
Regex.Matches(text, pattern).Count
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