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Your regular expression: IGNORECASE MULTILINE DOTALL VERBOSE Your test string: Today is 2020-09-20. pythex is a quick way to test your Python regular expressions. Try writing one or test the example Match result: Match captures: Regular expression cheatsheet Special characters \ escape special characters . matches any character ^ matches beginning of string $ matches end of string [5b-d] matches any chars '5', 'b', 'c' or 'd' [^a-c6] matches any char except 'a', 'b', 'c' or '6' R|S matches either regex R or regex S () creates a capture group and indicates precedence Quantifiers * 0 or more (append ? for non-greedy) + 1 or more (append ? for non-greedy) ? 0 or 1 (append ? for non-greedy) {m} exactly m m occurrences {m, n} from m to n . m defaults to 0, n to infinity {m, n}? from m to n , as few as possible Special sequences \A start of string \b matches empty string at word boundary (between \w and \W ) \B matches empty string not at word boundary \d digit \D non-digit \s whitespace: [ \t

\r\f\v] \S non-whitespace \w alphanumeric: [0-9a-zA-Z_] \W non-alphanumeric \Z end of string \g<id> matches a previously defined group Special sequences (?iLmsux) matches empty string, sets re.X flags (?:...) non-capturing version of regular parentheses (?P ...) matches whatever matched previously named group (?P= ) digit (?#...) a comment; ignored (?=...) lookahead assertion: matches without consuming (?!...) negative lookahead assertion (?<=...) lookbehind assertion: matches if preceded (?<!...) negative lookbehind assertion (?(id)yes|no) match 'yes' if group 'id' matched, else 'no' Based on tartley's python-regex-cheatsheet