MRAB wrote:
Ethan Furman wrote:
kj wrote:
Sometimes I want to split a string into lines, preserving the
end-of-line markers. In Perl this is really easy to do, by splitting
on the beginning-of-line anchor:
@lines = split /^/, $string;
But I can't figure out how to do the same thing with Python. E.g.:
import re
re.split('^', 'spam\nham\neggs\n')
['spam\nham\neggs\n']
re.split('(?m)^', 'spam\nham\neggs\n')
['spam\nham\neggs\n']
bol_re = re.compile('^', re.M)
bol_re.split('spam\nham\neggs\n')
['spam\nham\neggs\n']
Am I doing something wrong?
kynn
As you probably noticed from the other responses: No, you can't split
on _and_ keep the splitby text.
You _can_ split and keep what you split on:
>>> re.split("(x)", "abxcd")
['ab', 'x', 'cd']
You _can't_ split on a zero-width match:
>>> re.split("(x*)", "abxcd")
['ab', 'x', 'cd']
but you can use re.sub to replace zero-width matches with something
that's not zero-width and then split on that (best with str.split):
>>> re.sub("(x*)", "@", "abxcd")
'@a...@b@c...@d@'
>>> re.sub("(x*)", "@", "abxcd").split("@")
['', 'a', 'b', 'c', 'd', '']
Wow! I stand corrected, although I'm in danger of falling over from the
dizziness! :)
As impressive as that is, I don't think it does what the OP is looking
for. rurpy reminded us (or at least me ;) of .splitlines(), which seems
to do exactly what the OP is looking for. I do take some comfort that
my little snippet works for more than newlines alone, although I'm not
aware of any other use-cases. :(
~Ethan~
Oh, hey, how about this?
re.compile('(^[^\n]*\n?)', re.M).findall('text\ntext\ntext)
Although this does give me an extra blank segment at the end... oh well.
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