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[Changeset] Re: Behavior of the matlab regexptranslate function
From: |
David Bateman |
Subject: |
[Changeset] Re: Behavior of the matlab regexptranslate function |
Date: |
Sun, 23 Mar 2008 23:22:34 +0100 |
User-agent: |
Thunderbird 2.0.0.12 (X11/20080306) |
Ben Abbott wrote:
> I just finished the install of 2008a. The results from 2008a and 2007b
> (the same) are below.
>
>>> regexp ('file1.mat file2.mat file3.xls file4.mat', ...
> regexptranslate('wildcard','*.mat'), 'match')
>
> ans =
>
> 'file1.mat file2.mat file3.xls file4.mat'
>
>>> regexptranslate('wildcard','*.mat')
>
> ans =
>
> .*\.mat
>
> Ben
Tine to file a bug report against matlab then.. In any case thinking
further about it replacing '*.mat' with '.*\.mat' makes as much sense as
replacing it with '\w+\.mat' as otherwise how do you treat filenames
with spaces in them.. I suspect this is a case of a matlab developer
trying the write the DoWhatIWantNotWhatIAsked function, and the moral is
that you should learn the syntax of regexp rather than relying on a
particular behavior of the regexptranslate function.
In any case I attach a changeset that duplicates the behavior of the
matlab function.
D.
# HG changeset patch
# User David Bateman <address@hidden>
# Date 1206310594 -3600
# Node ID 35e6d57df330e64c57c044e6fe22d6c316344751
# Parent 8584a758a95de0f34e22e01c10d83013a1528175
Add the regexptranslate function
diff --git a/scripts/strings/Makefile.in b/scripts/strings/Makefile.in
--- a/scripts/strings/Makefile.in
+++ b/scripts/strings/Makefile.in
@@ -35,7 +35,7 @@ INSTALL_DATA = @INSTALL_DATA@
SOURCES = base2dec.m bin2dec.m blanks.m deblank.m dec2base.m \
dec2bin.m dec2hex.m findstr.m hex2dec.m index.m isletter.m \
- lower.m mat2str.m rindex.m split.m str2double.m str2mat.m \
+ lower.m mat2str.m regexptranslate.m rindex.m split.m str2double.m str2mat.m \
str2num.m strcat.m cstrcat.m strcmpi.m strfind.m strjust.m strmatch.m \
strncmpi.m strrep.m strtok.m strtrim.m strtrunc.m strvcat.m \
substr.m upper.m
diff --git a/scripts/strings/regexptranslate.m
b/scripts/strings/regexptranslate.m
new file mode 100644
--- /dev/null
+++ b/scripts/strings/regexptranslate.m
@@ -0,0 +1,48 @@
+## Copyright (C) 2008 David Bateman
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING. If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} realsqrt (@var{x})
+## Return the real natural logarithm of @var{x}. If any element results in the
+## return value being complex @code{reallog} produces an error.
+## @seealso{log, realsqrt, realpow}
+## @end deftypefn
+
+function y = regexptranslate (op, x)
+
+ if (ischar (op))
+ op = tolower (op);
+ if (strcmp ("wildcard", op))
+ y = regexprep (regexprep (regexprep (x, "\\.", "\\."), "\\*",
+ ".*"), "\\?", ".");
+ elseif (strcmp ("escape", op))
+ ch = {'\$', '\.', '\?', '\[', '\]'};
+ y = x;
+ for i = 1 : length (ch)
+ y = regexprep (y, ch{i}, ch{i});
+ endfor
+ else
+ error ("regexptranslate: unexpected operation");
+ endif
+ else
+ error ("regexptranslate: expecting operation to be a string");
+ endif
+endfunction
+
+%!assert (regexptranslate ("wildcard", "/a*b?c."), "/a.*b.c\\.")
+%!assert (regexptranslate ("escape", '$.?[]'), '\$\.\?\[\]')