Hello,
Let's imagine that we have a simple function that generates a
replacement for a regular expression:
def process(match):
return match.string
If we use that simple function with re.sub using a simple pattern and
a string we get the expected output:
re.sub('123', process, '123')
'123'
However, if the string passed to re.sub contains a trailing new line
character, then we get an extra new line character unexpectedly:
re.sub(r'123', process, '123\n')
'123\n\n'
If we try to get the same result using a replacement string, instead
of a function, the strange behaviour cannot be reproduced:
re.sub(r'123', '123', '123')
'123'
re.sub('123', '123', '123\n')
'123\n'
Is there any explanation for this? If I'm skipping something when
using a replacement function with re.sub, please let me know.
Best regards,
Javier
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