Re: Why is regexp not working?
On Fri, 04 Jul 2014 14:27:12 +0200, Florian Lindner wrote: self.regexps = [rit (?Pcoupling_iterations\d+) .* dt complete yes | write-iteration-checkpoint |, rit (?Pit_read_ahead\d+) read ahead My first thought is what is the effect of '|' as the last character in the regex? -- Denis McMahon, denismfmcma...@gmail.com -- https://mail.python.org/mailman/listinfo/python-list
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 = [rit (?Pcoupling_iterations\d+) .* dt complete yes |
write-iteration-checkpoint |,
rit (?Pit_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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Re: Why is regexp not working?
On 2014-07-04 13:27, Florian Lindner wrote:
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 = [rit (?Pcoupling_iterations\d+) .* dt complete yes |
write-iteration-checkpoint |,
rit (?Pit_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.
The character '|' is a metacharacter that separates alternatives. For
example, the regex 'a|b' will match 'a' or b'.
Your regexes end with '|', which means that they will match an empty
string at the start of the target string.
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