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Why is regexp not working?

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  Why is regexp not working? Florian Lindner <mailinglists@xgm.de> - 2014-07-04 14:27 +0200
    Re: Why is regexp not working? Denis McMahon <denismfmcmahon@gmail.com> - 2014-07-06 02:58 +0000

#73952 — Why is regexp not working?

Hello,

I have that piece of code:

    def _split_block(self, block):
        cre = [re.compile(r, flags = re.MULTILINE) for r in self.regexps]
        block = "".join(block)
        print(block)
        print("-------------------")
        for regexp in cre:
            match = regexp.match(block)
            for grp in regexp.groupindex:
                data = match.group(grp) if match else None
                self.data[grp].append(data)


block is a list of strings, terminated by \n. self.regexps:


self.regexps = [r"it (?P<coupling_iterations>\d+) .* dt complete yes | 
write-iteration-checkpoint |",
                r"it (?P<it_read_ahead>\d+) read ahead"


If I run my program it looks like that:


it 1 ahadf dt complete yes | write-iteration-checkpoint |
Timestep completed

-------------------
it 1 read ahead
it 2 ahgsaf dt complete yes | write-iteration-checkpoint |
Timestep completed

-------------------
it 4 read ahead
it 3 dfdsag dt complete yes | write-iteration-checkpoint |
Timestep completed

-------------------
it 9 read ahead
it 4 dsfdd dt complete yes | write-iteration-checkpoint |
Timestep completed

-------------------
it 16 read ahead
-------------------
{'it_read_ahead': [None, '1', '4', '9', '16'], 'coupling_iterations': ['1', 
None, None, None, None]}

it_read_ahead is always matched when it should (all blocks but the first). 
But why is the regexp containing coupling_iterations only matched in the 
first block?

I tried different combinations using re.match vs. re.search and with or 
without re.MULTILINE.

Thanks!
Florian

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#74003

On Fri, 04 Jul 2014 14:27:12 +0200, Florian Lindner wrote:

> self.regexps = [r"it (?P<coupling_iterations>\d+) .* dt complete yes |
> write-iteration-checkpoint |",
>                 r"it (?P<it_read_ahead>\d+) read ahead"

My first thought is what is the effect of '|' as the last character in 
the regex?

-- 
Denis McMahon, denismfmcmahon@gmail.com

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