Re: [Jython-users] URGENT! mysterious errors in sre.py

[Robert K. <rob...@ya...>]

hi brian,

thanks. shortly after sending
my message i examined the regex
once again and noticed that it seems
to reduntant. so << \s* >> would have
doen it too.

the problem was, that it worked under
by installation (jpython 1.1+7) and
as i tried to install it under jython 2.0
it didnt work anymore.

ciao robertj

--- brian zimmer <bz...@zi...> wrote:
> At 06:26 AM 4/5/2001 -0700, you wrote:
> >hi,
> >
> >i am trying to compile a regex and
> >on trying so i recive the following
> >error:
> >>>>
> >File "E:\tools\jython\Lib\sre.py", line 63, in
> compile
> >File "E:\tools\jython\Lib\sre.py", line 104, in
> >_compile
> >error: nothing to repeat
> >>>>
> >
> >does anybody has any idea what i am doing wrong
> >
> >here te script that creates the error
> >>>>
> >import re
> >PYCMD = "^(\s*)?<%.*%>(\s*)?$"
> >PYCMD_COMPILER = re.compile(PYCMD)
> >>>>
> 
> Here's my setup:
> 
> Jython 2.1a1 on java1.3.0 (JIT: null)
> Type "copyright", "credits" or "license" for more
> information.
> 
> I think the problem is the '?' in the expression. 
> It's job is 'either repeat 0 or 1' of the preceeding
> RE or make the preceeding RE non-greedy.  You have
> it after the closing ')' which is not really a RE,
> it's just a grouping clause.  Try this:
> 
> >>> import re
> >>> re.compile(r"^(\s*?)<%.*%>(\s*?)$")
> org.python.modules.sre.PatternObject@a0d51
> 
> CPython is the same:
> 
> ActivePython 2.0, build 202 (ActiveState Tool Corp.)
> based on Python 2.0 (#8, Oct 19 2000, 11:30:05) [MSC
> 32 bit (Intel)] on win32
> Type "copyright", "credits" or "license" for more
> information.
> >>> import re
> >>> re.compile(r"^(\s*?)<%.*%>(\s*?)$")
> <SRE_Pattern object at 0082E9F0>
> >>> re.compile(r"^(\s*)?<%.*%>(\s*)?$")
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "d:\python\cpython\2.0\lib\sre.py", line 62,
> in compile
>     return _compile(pattern, flags)
>   File "d:\python\cpython\2.0\lib\sre.py", line 102,
> in _compile
>     raise error, v # invalid expression
> sre_constants.error: nothing to repeat
> 
> I used
> http://python.org/doc/current/lib/re-syntax.html as
> reference.
> 
> brian
> 


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