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python 2.6.8
s= '''
foo
bar
baz
'''
>>>re.findall(r'^\S*',s,re.MULTILINE)
['', 'foo', 'bar', 'baz', '']
>>>ptrn = re.compile(r'^\S*',re.MULTILINE)
>>>ptrn.findall(s)
['', 'foo', 'bar', 'baz', '']
>>>ptrn.findall(s,re.MULTILINE)
['baz', '']
Why is there a difference between using MULTILINE flag in findall?
603
findall. findall() is probably the single most powerful function in the re module. Above we used re.search() to find the first match for a pattern. findall() finds *all* the matches and returns them as a list of strings, with each string representing one match.
MULTILINE flag tells python to make the '^' and '$' special characters match the start or end of any line within a string. Using this flag: >>> match = re.search(r'^It has. *', paragraph, re.
The m flag indicates that a multiline input string should be treated as multiple lines. For example, if m is used, ^ and $ change from matching at only the start or end of the entire string to the start or end of any line within the string.
Practical Data Science using PythonDOTALL flag tells python to make the '. ' special character match all characters, including newline characters. This is a paragraph. It has multiple lines.
When calling the findall() method on a regex object, the second parameter is not the flags argument (because that has already been used when compiling the regex) but the pos argument, telling the regex engine at which point in the string to start matching.
re.MULTILINE is just an integer (that happens to be 8).
See the docs.
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