Ask for help on using re

[Peter Pearson]

On Thu, 5 Aug 2021 02:40:30 -0700 (PDT), Jach Feng <jfong at ms4.hinet.net> wrote:
  I want to distinguish between numbers with/without a dot attached:
 
 >>> text = 'ch 1. is\nch 23. is\nch 4 is\nch 56 is\n'
 >>> re.compile(r'ch \d{1,}[.]').findall(text)
  ['ch 1.', 'ch 23.']
 >>> re.compile(r'ch \d{1,}[^.]').findall(text)
  ['ch 23', 'ch 4 ', 'ch 56 ']
 
  I can guess why the 'ch 23' appears in the second list. But how to get
  rid of it?

>>> re.findall(r'ch \d+[^.0-9]', "ch 1. is ch 23. is ch 4 is ch 56 is ")
['ch 4 ', 'ch 56 ']

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