Re: Matching PCRE

[Paul Schmehl <pschmehl_lists () tx rr com>]

Yes, but in practice that means that \1 can match eapples with apple and 
sams with hams and adams with ams.  But I only want sams to match sams and 
eapples to match eapples and adams with adams.

--On January 19, 2010 6:45:45 PM -0600 Joel Esler <jesler () sourcefire com> 
wrote:

> \1 will match a previous parenthetical match. \2, etc.
>
> --
> Joel Esler
>
> On Jan 19, 2010, at 7:07 PM, Paul Schmehl <pschmehl_lists () tx rr com>
> wrote:
>
> > Which raised a question in mind which I've been unable to find an
> > answer to.
> > Is there any sort of backreference in pcre that requires an *exact*
> > match with
> > the previous string?  IOW, if I have eeapple as a match, is there
> > anyway to
> > force the backreference to only match on the entire string and not
> > any one part
> > of it?
> >
> > I poked around on the web and found \$ and \0, but neither seemed to
> > do the
> > trick.  I could return to \d instead of \w, but that would eliminate
> > an entire
> > class of sql injection matches (e.g. or a=a, etc.)
> >
> > --On Tuesday, January 19, 2010 15:13:46 -0600 Matt Olney
> > <molney () sourcefire com> wrote:
> >
> > > I think greediness may be biting you in the butt...
> > >
> > >
> > > So this would match:
> > >
> > >  re> /(\w+).?=.?\1/   <----rough rewrite of your pcre
> > > data> applee=eapple
> > > 0: applee=eapple
> > > 1: apple
> > > data> sap=bsa
> > > 0: sap=bsa
> > > 1: sa
> > > data> buffalo=uffalo
> > > 0: uffalo=uffalo
> > > 1: uffalo
> > > data> buff=abuf
> > > 0: buff=abuf
> > > 1: buf
> >
> >
> >
> > --
> > Paul Schmehl, Senior Infosec Analyst
> > As if it wasn't already obvious, my opinions
> > are my own and not those of my employer.
> > *******************************************
> > "It is as useless to argue with those who have
> > renounced the use of reason as to administer
> > medication to the dead." Thomas Jefferson
> >
> >
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Paul Schmehl, If it isn't already
obvious, my opinions are my own
and not those of my employer.
******************************************
WARNING: Check the headers before replying


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Throughout its 18-year history, RSA Conference consistently attracts the
world's best and brightest in the field, creating opportunities for Conference
attendees to learn about information security's most important issues through
interactions with peers, luminaries and emerging and established companies.
http://p.sf.net/sfu/rsaconf-dev2dev
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