jython-users

[Jython-users] help on simple regular expression?

[Chris G. <cg...@gc...>]

Hi,

I'm trying to use a regular expression that uses backreferences in python.
Can someone tell me where I cam going wrong?

[cgokey@cgokey cgokey]$ jython
Jython 2.1a1 on java1.3.0 (JIT: jitc)
Type "copyright", "credits" or "license" for more information.
>>> import re
>>> s = "   Title: Ice Core Records"
>>> s = re.sub("^(\s*)Title","\1Dataset_Title",s);
>>> s
'\001Dataset_Title: Ice Core Records'
>>> print s
Dataset_Title: Ice Core Records
>>>

It looks like it isn't using the back reference?  The resulting output
should be indented 3 spaces.

Thanks,
Chris

-- 
 __________________________________________________
/\				   	           \
\_| Christopher D. Gokey, SSAI, NASA/GCMD          |
  | 18 Martin Road, Shelburne Falls, MA  01370     |
  | Phone: Voice (413) 625-8129 / FAX 208-248-9055 |
  | cg...@gc... / http://gcmd.nasa.gov    |
  | ICQ #52132386, AOL IM: chrisgokey              |
  |   _____________________________________________|_
   \_/______________________________________________/

Re: [Jython-users] help on simple regular expression?

[Kevin B. <kb...@ca...>]

You're not quoting the backslashes.

You can either double the backslashes:

s = re.sub("^(\\s*)Title","\\1Dataset_Title",s)

Or use raw strings (preferred):

s = re.sub(r"^(\s*)Title",r"\1Dataset_Title",s)

kb


Chris Gokey wrote:
> 
> Hi,
> 
> I'm trying to use a regular expression that uses backreferences in python.
> Can someone tell me where I cam going wrong?
> 
> [cgokey@cgokey cgokey]$ jython
> Jython 2.1a1 on java1.3.0 (JIT: jitc)
> Type "copyright", "credits" or "license" for more information.
> >>> import re
> >>> s = "   Title: Ice Core Records"
> >>> s = re.sub("^(\s*)Title","\1Dataset_Title",s);
> >>> s
> '\001Dataset_Title: Ice Core Records'
> >>> print s
> Dataset_Title: Ice Core Records
> >>>
> 
> It looks like it isn't using the back reference?  The resulting output
> should be indented 3 spaces.
> 
> Thanks,
> Chris
> 
> --
>  __________________________________________________
> /\                                                 \
> \_| Christopher D. Gokey, SSAI, NASA/GCMD          |
>   | 18 Martin Road, Shelburne Falls, MA  01370     |
>   | Phone: Voice (413) 625-8129 / FAX 208-248-9055 |
>   | cg...@gc... / http://gcmd.nasa.gov    |
>   | ICQ #52132386, AOL IM: chrisgokey              |
>   |   _____________________________________________|_
>    \_/______________________________________________/
> 
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users

Re: [Jython-users] help on simple regular expression?

[Brian Z. <bri...@ya...>]

c:\> jython
Jython 2.1a1 on java1.3.1 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> import re
>>> s = "   Title: Ice Core Records"
>>> t = re.sub("^\(\s*\)Title", "\1Dataset_Title", s)
>>> t
'   Title: Ice Core Records'
>>> t = re.sub("^(?P<ident>\s*)Title", "\g<ident>Dataset_Title", s)
>>> t
'   Dataset_Title: Ice Core Records'

----- Original Message -----
From: "Chris Gokey" <cg...@gc...>
To: <jyt...@li...>
Sent: Tuesday, July 03, 2001 8:14 AM
Subject: [Jython-users] help on simple regular expression?


> Hi,
>
> I'm trying to use a regular expression that uses backreferences in python.
> Can someone tell me where I cam going wrong?
>
> [cgokey@cgokey cgokey]$ jython
> Jython 2.1a1 on java1.3.0 (JIT: jitc)
> Type "copyright", "credits" or "license" for more information.
> >>> import re
> >>> s = "   Title: Ice Core Records"
> >>> s = re.sub("^(\s*)Title","\1Dataset_Title",s);
> >>> s
> '\001Dataset_Title: Ice Core Records'
> >>> print s
> Dataset_Title: Ice Core Records
> >>>
>
> It looks like it isn't using the back reference?  The resulting output
> should be indented 3 spaces.
>
> Thanks,
> Chris
>
> --
>  __________________________________________________
> /\               \
> \_| Christopher D. Gokey, SSAI, NASA/GCMD          |
>   | 18 Martin Road, Shelburne Falls, MA  01370     |
>   | Phone: Voice (413) 625-8129 / FAX 208-248-9055 |
>   | cg...@gc... / http://gcmd.nasa.gov    |
>   | ICQ #52132386, AOL IM: chrisgokey              |
>   |   _____________________________________________|_
>    \_/______________________________________________/
>
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users
>