I have some code like this one:
>>> import re
>>> p = re.compile('my pattern')
>>> print p
_sre.SRE_Pattern object at 0x02274380
Is it possible to get string "my pattern" from p variable?
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3 Answers
p.pattern
Read more about re module here: http://docs.python.org/library/re.html
4 Comments
Mykola Kharechko
Thanks. I don't read docs becouse i try i dir(p) and it display only several attributes and methods. stackoverflow.com/questions/1415924/…
Anentropic
I did the same, assumed there was no simple way to get it :)
David Lam
seems like in python3 dir(some_compiled_pattern) displays the attributes, but not in 2.7
Aaron
>Why not to read docs before posting such questions? Because when you google StackOverflow returns first. Perfectly valid question.
From the "Regular Expression Objects" section of the re module documentation:
RegexObject.patternThe pattern string from which the RE object was compiled.
For example:
>>> import re
>>> p = re.compile('my pattern')
>>> p
<_sre.SRE_Pattern object at 0x1001ba818>
>>> p.pattern
'my pattern'
With the re module in Python 3.0 and above, you can find this by doing a simple dir(p):
>>> print(dir(p))
['__class__', '__copy__', '__deepcopy__', '__delattr__', '__doc__',
'__eq__', '__format__', '__ge__', '__getattribute__', '__gt__',
'__hash__', '__init__', '__le__', '__lt__', '__ne__', '__new__',
'__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__',
'__str__', '__subclasshook__', 'findall', 'finditer', 'flags',
'groupindex', 'groups', 'match', 'pattern', 'scanner', 'search',
'split', 'sub', 'subn']
This however does not work on Python 2.6 (or 2.5) - the dir command isn't perfect, so it's always worth checking the docs!
>>> print dir(p)
['__copy__', '__deepcopy__', 'findall', 'finditer', 'match', 'scanner',
'search', 'split', 'sub', 'subn']
Comments
Yes:
print p.pattern
hint, use the dir function in python to obtain a list of members:
dir(p)
this lists:
['__class__', '__copy__', '__deepcopy__', '__delattr__', '__doc__', '__eq__',
'__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__',
'__le__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__',
'__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__',
'findall', 'finditer', 'flags', 'groupindex', 'groups', 'match', 'pattern',
'scanner', 'search', 'split', 'sub', 'subn']
answered Sep 12, 2009 at 19:39
Lasse V. Karlsen
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1 Comment
Jochen Ritzel
help( value ) is much more useful on the console.