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1 ## Copyright (C) 2004, 2006, 2007 by Alois Schloegl |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {@var{idx} =} strfind (@var{str}, @var{pattern}) |
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21 ## @deftypefnx {Function File} {@var{idx} =} strfind (@var{cellstr}, @var{pattern}) |
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22 ## Search for @var{pattern} in the string @var{str} and return the |
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23 ## starting index of every such occurrence in the vector @var{idx}. |
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24 ## If there is no such occurrence, or if @var{pattern} is longer |
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25 ## than @var{str}, then @var{idx} is the empty array @code{[]}. |
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26 ## |
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27 ## If the cell array of strings @var{cellstr} is specified instead of the |
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28 ## string @var{str}, then @var{idx} is a cell array of vectors, as specified |
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29 ## above. |
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30 ## @seealso{findstr, strmatch, strcmp, strncmp, strcmpi, strncmpi} |
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31 ## @end deftypefn |
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32 |
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33 ## Author: alois schloegl <a.schloegl@ieee.org> |
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34 ## Created: 1 November 2004 |
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35 ## Adapted-By: William Poetra Yoga Hadisoeseno <williampoetra@gmail.com> |
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36 |
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37 function idx = strfind (text, pattern) |
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38 |
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39 if (nargin != 2) |
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40 print_usage (); |
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41 elseif (! ischar (pattern)) |
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42 error ("strfind: pattern must be a string value"); |
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43 endif |
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44 |
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45 lp = length (pattern); |
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46 |
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47 if (ischar (text)) |
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48 idx = __strfind_string__ (text, pattern, lp); |
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49 elseif (iscellstr (text)) |
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50 idx = cell (size (text)); |
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51 for i = 1:(numel (text)) |
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52 idx{i} = __strfind_string__ (text{i}, pattern, lp); |
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53 endfor |
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54 else |
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55 error ("strfind: text must be a string or cell array of strings"); |
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56 endif |
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57 |
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58 ### endfunction |
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59 |
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60 function idx = __strfind_string__ (text, pattern, lp) |
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61 |
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62 idx = 1:(length (text) - lp + 1); |
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63 k = 0; |
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64 while (k < lp && ! isempty (idx)) |
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65 idx = idx(text(idx + k) == pattern(++k)); |
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66 endwhile |
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67 |
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68 ### endfunction |
