[Chicago] regular expression headache

[Robert Spelich]

Thanks Yarko. I'll give it a try.


On Mon, Jan 13, 2014 at 12:56 PM, Yarko Tymciurak <yarkot1 at gmail.com> wrote:

>
> On Jan 13, 2014 10:36 AM, "JS Irick" <hundredpercentjuice at gmail.com>
> wrote:
> >
> > Robert-
> >
> > You need to use raw strings for regular expressions, otherwise your
> regexp special characters will not be properly interpreted.  (experts,
> please correct any terms I have wrong here)
> >
> > Replace this line
> > regex = re.compile("^(?:Post (?:Office )?|P[. ]?O\.? )?Box\b")
> > with
> > regex = re.compile(r'^(?:Post (?:Office )?|P[. ]?O\.? )?Box\b')
> >
>
> I would not offer this following "or"  - it makes things conditional.
>
> The issue is that strings get interpreted on read, so if you put the
> string in a variable, how many times does it get interpreted?  What about
> when you put it in a variable, and append or otherwise change it (someday)
> programmatically (think:  settings).
>
>
> r'somethin'  keeps it clean.
>
>
> > Or you could escape your slashes:
> > regex = re.compile("^(?:Post (?:Office )?|P[. ]?O\.? )?Box\\b")
> >
> > Thank you.  -js
> >
> >
> > On Sat, Jan 11, 2014 at 8:42 PM, Steve Schwarz <steve at agilitynerd.com>
> wrote:
> >>
> >> For me, when it comes to writing regexps I always write a ton of test
> strings ordered easy to hard and start from very short simple regexps until
> they all pass.
> >>
> >> On Saturday, January 11, 2014, Robert Spelich wrote:
> >>>
> >>> Steve,
> >>> Thank you so much! I can't tell you how much time I spent trying to
> get this to run.
> >>> -Bob S.
> >>>
> >>>
> >>> On Sat, Jan 11, 2014 at 6:21 PM, Steve Schwarz <steve at agilitynerd.com>
> wrote:
> >>>>
> >>>> I tested it in python 2.5, 2.7.6 and 3.3 and it fails in all of them.
> Seems to be the "\b", when I remove it it matches.
> >>>> Steve
> >>>>
> >>>>
> >>>> On Sat, Jan 11, 2014 at 5:40 PM, Robert Spelich <rlspelich at gmail.com>
> wrote:
> >>>>>
> >>>>> import re
> >>>>> address = 'PO Box 34'
> >>>>> regex = re.compile("^(?:Post (?:Office )?|P[. ]?O\.? )?Box\b")
> >>>>> mo = regex.search(address)
> >>>>> mo
> >>>>>
> >>>>> This should return a match object. It returns one when I test it at
> http://www.pythonregex.com.
> >>>>>
> >>>>> Thanks again.-Bob
> >>>>>
> >>>>>
> >>>>> On Sat, Jan 11, 2014 at 5:18 PM, Steve Schwarz <
> steve at agilitynerd.com> wrote:
> >>>>>>
> >>>>>> Bob,
> >>>>>> Can you post your code/tests? Then we can try it out too and help
> debug what is going on.
> >>>>>>
> >>>>>> Best Regards,
> >>>>>> Steve
> >>>>>> Blogs: http://agilitynerd.com/  http://tech.agilitynerd.com/
> >>>>>> Dog Agility Search: http://googility.com/
> >>>>>> Dog Agility Courses: http://agilitycourses.com/
> >>>>>> http://www.facebook.com/AgilityNerd
> >>>>>>
> >>>>>> On Sat, Jan 11, 2014 at 4:47 PM, Robert Spelich <
> rlspelich at gmail.com> wrote:
> >>>>>>>
> >>>>>>> Can anyone offer me a suggestion as to why a regular expression
> that validates on a testing tool would not match on the same string when
> run in a script or directly in the interpreter? I used 2 different online
> tools, one a general expression tool and one Python specific. They both
> matched, when run locally it does not match.
> >>>>>>>
> >>>>>>> I am using an re from a cookbook to match addresses in a database
> that start with a PO Box address. I am using 2.7. I am stumped.
> >>>>>>>
> >>>>>>> po_box = re.compile('^(?:Post (?:Office )?|P[. ]?O\.? )?Box\b')
> >>>>>>>
> >>>>>>> Thanks in advance if anyone can help me out.
> >>>>>>>
> >>>>>>> -Bob S.
> >>>>>>>
> >>>>>>> _______________________________________________
> >>>>>>> Chicago mailing list
> >>>>>>> Chicago at python.org
> >>>>>>> https://mail.python.org/mailman/listinfo/chicago
> >>>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> --
> >>>>>>
> >>>>>>
> >>>>>> _______________________________________________
> >>>>>> Chicago mailing list
> >>>>>> Chicago at python.org
> >>>>>> https://mail.python.org/mailman/listinfo/chicago
> >>>>>>
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> Chicago mailing list
> >>>>> Chicago at python.org
> >>>>> https://mail.python.org/mailman/listinfo/chicago
> >>>>>
> >>>>
> >>>>
> >>>>
> >>>> --
> >>>> Best Regards,
> >>>> Steve
> >>>> Blogs: http://agilitynerd.com/  http://tech.agilitynerd.com/
> >>>> Dog Agility Search:
> >>
> >>
> >>
> >> --
> >> Sent from my phone, sorry if it is brief.
> >>
> >> _______________________________________________
> >> Chicago mailing list
> >> Chicago at python.org
> >> https://mail.python.org/mailman/listinfo/chicago
> >>
> >
> >
> >
> > --
> > ====
> > JS Irick
> > 312-307-8904
> > Consultant: truqua.com
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> > Programmer: juicetux.com
> >
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> >
>
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