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
> 
> --
>  __________________________________________________
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