regex-coach

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regex-coach@common-lisp.net

June 2009

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2 discussions

Re: [regex-coach] Regex Coach/CL-PPCRE question
by Edi Weitz 25 Jun '09

25 Jun '09

[Cc to mailing list.] Thanks for the report, this definitely looks like a bug. I'll see to have this fixed in the next release. Cheers, Edi. On Wed, Jun 24, 2009 at 10:45 PM, Dan Moniz<dnm(a)pobox.com> wrote: > Hi there, > > I'm using Regex Coach 0.9.2 (built with CL-PPCRE 1.3.2) and noticed > some unexpected behavior when using the \b token. It seems to be > working fine, but the Info tab displays "the selection is NIL" for the > token, rather than the expected word boundary explanation. It *does* > seem to get \B (the negation of \b) right: "the selection is a space > between two characters which is not a word boundary". > > I initially discovered this while trying to troubleshoot and test a > regex from another system/product (unrelated, and at present I'm not > certain what regex engine it uses, though I'm assuming PCRE or POSIX > with GNU extensions): > > regex: type\b\w*?\btext\b\w*?\bjavascript > > using Regex Coach's Info and Tree tabs to "debug" the expression and > why it wasn't seeming to match a string I though it should. Initially > I thought \b might be unsupported, but it does seem to work in a > simpler test case: > > regex: \bis\b > string: This island is beautiful > > The CL-PPCRE documentation confirmed that both \b and \B were > supported as well. Nonetheless, the NIL replacement in the Info tab > was odd. > > FWIW, I'm running on Windows Vista Ultimate with SP1 installed. > > Hope this helps. Thanks for making Regex Coach, and thanks for making > it available. > > > -- > Dan Moniz <dnm(a)pobox.com> [http://pobox.com/~dnm/] > >

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[regex-coach] Please implement variable length look-behind functionality
by Alex Grässer 25 Jun '09

25 Jun '09

Hi Edmund Thank you very much for Regex Coach. It has helped tremendously! Recently I needed to use a negative look-behind with multiple exclusions and found that Regex Coach does not support variable length look-behind. \\[^\\]*(?<!(tmp|files))$ gives an error that "Variable length look-behind not implemented (yet)" whereas \\[^\\]*(?<!(tmp|les))$ works, except that it excludes more than required. Interestingly WinMerge also has this restriction ;-) Thanks Alex

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