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Re: Utility to locate errors in regular expressions

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On May 24, 5:58 pm, Malte Forkel <malte.for...@berlin.de> wrote:
> Finding out why a regular expression does not match a given string can
> very tedious. I would like to write a utility that identifies the
> sub-expression causing the non-match. My idea is to use a parser to
> create a tree representing the complete regular expression. Then I could
> simplify the expression by dropping sub-expressions one by one from
> right to left and from bottom to top until the remaining regex matches.
> The last sub-expression dropped should be (part of) the problem.
>
> As a first step, I am looking for a parser for Python regular
> expressions, or a Python regex grammar to create a parser from.
>
> But may be my idea is flawed? Or a similar (or better) tools already
> exists? Any advice will be highly appreciated!
>
> Malte



python-specific:  http://kodos.sourceforge.net/
Online: http://gskinner.com/RegExr/
emacs-specific: re-builder and regex-tool http://bc.tech.coop/blog/071103.html

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Thread

Utility to locate errors in regular expressions Malte Forkel <malte.forkel@berlin.de> - 2013-05-24 14:58 +0200
  Re: Utility to locate errors in regular expressions Roy Smith <roy@panix.com> - 2013-05-24 09:12 -0400
    Re: Utility to locate errors in regular expressions Neil Cerutti <neilc@norwich.edu> - 2013-05-24 13:58 +0000
  Re: Utility to locate errors in regular expressions rusi <rustompmody@gmail.com> - 2013-05-24 07:09 -0700
  Re: Utility to locate errors in regular expressions Christian Gollwitzer <auriocus@gmx.de> - 2013-05-24 20:21 +0200

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