re module methods: flags(), pattern()

[Xah Lee]

Python re module has methods flags and pattern. How to use these
exactly?

e.g. i tried

print patternObj.flag s()

and the error is some "int object is not callable".

newpattern=re.c ompile(ur'\w+', patternObj.flag s())

also bad.

similar error for patternObj.patt ern(). (and i suppose the same for
groupindex() )

thanks.

Xah
xah@xahlee.org
∑ http://xahlee.org/

[Reinhold Birkenfeld]

Re: re module methods: flags(), pattern()

Xah Lee wrote:[color=blue]
> Python re module has methods flags and pattern. How to use these
> exactly?
>
> e.g. i tried
>
> print patternObj.flag s()
>
> and the error is some "int object is not callable".[/color]

Where do you read "methods"?

Reinhold

[Kay Schluehr]

Re: re module methods: flags(), pattern()

Xah Lee wrote:[color=blue]
> Python re module has methods flags and pattern. How to use these
> exactly?[/color]
[color=blue]
>From the Python 2.3 documentation, section 2.4.2[/color]

flags

The flags argument used when the RE object was compiled, or 0 if no
flags were provided.


groupindex

A dictionary mapping any symbolic group names defined by (?P<id>) to
group numbers. The dictionary is empty if no symbolic groups were used
in the pattern.

pattern

The pattern string from which the RE object was compiled.


Comments derived from the docs and error messages:
[color=blue]
> e.g. i tried
>
> print patternObj.flag s()
>
> and the error is some "int object is not callable".[/color]

=> flags is an int object
[color=blue]
>
> newpattern=re.c ompile(ur'\w+', patternObj.flag s())
>
> also bad.[/color]

=> flags is still an int object

[color=blue]
> similar error for patternObj.patt ern().[/color]

=> pattern is a string
[color=blue]
> (and i suppose the same for
> groupindex() )[/color]

=> groupindex is a dict
[color=blue]
>
> thanks.
>
> Xah
> xah@xahlee.org
> ∑ http://xahlee.org/[/color]

The documentation is not that bad that one should not read it at all ;)


If You wrestle with regexps I can recommend an old but still usefull
little wrapper I found eventually on the "Vaults of Parnassus" which is
called reverb.py

Ciao,
Kay

[André Søreng]

Re: re module methods: flags(), pattern()


A flag is just an int. From the re doc, you can see
there is a ignorecase flag:

"
I
IGNORECASE
Perform case-insensitive matching; expressions like [A-Z] will
match lowercase letters, too. This is not affected by the current locale.
"

Using the ignorecase flag:
[color=blue][color=green][color=darkred]
>>> import re
>>> print re.I[/color][/color][/color]
2[color=blue][color=green][color=darkred]
>>> print re.IGNORECASE[/color][/color][/color]
2[color=blue][color=green][color=darkred]
>>> r = re.compile("hel lo", re.IGNORECASE)
>>> print r.pattern[/color][/color][/color]
'hello'[color=blue][color=green][color=darkred]
>>> match = r.search("heLLo ")
>>> match.group()[/color][/color][/color]
'heLLo'

As the doc says, you can combine several flags with the '|' operator:
r = re.compile("you r_regexp", re.SOMEFLAG|re. SOMEOTHERFLAG)


Xah Lee wrote:[color=blue]
> Python re module has methods flags and pattern. How to use these
> exactly?
>
> e.g. i tried
>
> print patternObj.flag s()
>
> and the error is some "int object is not callable".
>
> newpattern=re.c ompile(ur'\w+', patternObj.flag s())
>
> also bad.
>
> similar error for patternObj.patt ern(). (and i suppose the same for
> groupindex() )
>
> thanks.
>
> Xah
> xah@xahlee.org
> ∑ http://xahlee.org/
>[/color]