Python regular-use experience

1.match () Start match from start position
2.search () matches any position, if there are multiple matches, only the first one is returned.
3.finditer () returns all matches
4. Each match is the best match possible. For example:
>>> m = re.compile (' abc[bcd]*b ')
>>> m.findall (' ABCBCBCB ')
[' ABCBCBCB ']
In fact, ABCBCB is also a matching abc[bcd]*b, but only returns one of the largest matching values.
5.split () method
A. The maximum number of divisions can be specified by dividing the string according to the regular type
>>> p = re.compile (R ' \w+ ')
>>> P.split (' This was a test, short and sweet, of Split (). ')
[' This ', ' was ', ' a ', ' test ', ' short ', ' and ', ' Sweet ', ' of ', ' split ', ']
B. Sometimes, you are not only interested in the text between delimiters, you also need to know what the delimiter is.
If the capture brackets are used in RE, their values are also returned as part of the list. Compare the following calls:
>>> P2 = re.compile (R ' (\w+) ')
[' This ', ' ... ', ' is ', ', ' a ', ' ', ' test ', '. '

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