If youre on Windows, you can test the native c# behvaior with a software called Rad Software regular expression designer. Its very helpful.
On Wed, Jun 1, 2011 at 8:44 PM, Bill Janssen <jans...@parc.com> wrote: > Jeff Hardy <jdha...@gmail.com> wrote: > > > On Wed, Jun 1, 2011 at 4:03 PM, Bill Janssen <jans...@parc.com> wrote: > > > I have a large RE (223613 chars) that works fine in CPython 2.6, but > > > > That's truly horrible, but I assume you have a good reason for it. > > Hi, Jeff. Yes, I think so. > > > > seems to produce an endless loop in IronPython (see below). I'm using > > > Mono 2.10 (.NET 4.0.x) on Ubuntu, with IronPython 2.7. Anyone have > > > pointers to the differences between them? Is > > > System::Text::RegularExpressions in .NET configurable in some fashion > > > that might help? > > > > First off, is there a reason you don't use re.IGNORECASE? That would > > cut the regex in half, at least. > > Sure. Names sensitive to capitalization; the rule I'm implementing says > names are either capitalized or upper-case. > > > For the most part, CPython and IronPython regexes should be fairly > > compatible - IronPython takes the regex and massages it to work with > > System.Text.RE, but the changes are pretty straightforward and small, > > Are those changes documented anywhere? > > > and I don't think the re you provided hits any of them. It's quite > > possible that the Mono version of System.Text.RE can't handle the > > expression; you could test this saving the full regex and building a > > small C# program that runs it. The regex template has a lot of > > potential backtracking in it; are you sure it's not caught in a > > pathological (exponential) case? > > No; all I'm sure of is that this runs in 1.2 seconds in CPython, and > takes up a core for 15 minutes (till I kill it) with IronPython/Mono. > Something is clearly hitting a bug somewhere... I suppose I should > try it on Windows. > > > Finally, is one ginormous really the best way to do this? Have you > > tried other approaches? > > No need, until I hit .NET. I'm used to working with a full-featured > finite-state machine (PARC's xfst; see > http://www.cis.upenn.edu/~cis639/docs/xfst.html), and was wondering if > we could do similar things with Python's RE machinery. Long lists like > these names are often used for lists of companies or cities or such. > People's names are actually a fairly simple and short example of this :-). > > Bill > _______________________________________________ > Users mailing list > Users@lists.ironpython.com > http://lists.ironpython.com/listinfo.cgi/users-ironpython.com > -- George R. C. Silva Desenvolvimento em GIS http://geoprocessamento.net http://blog.geoprocessamento.net
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