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1 ## Copyright (C) 2004 by Alois Schloegl |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or |
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4 ## modify it under the terms of the GNU General Public License |
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5 ## as published by the Free Software Foundation; either version 2 |
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6 ## of the License, or (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with Octave; see the file COPYING. If not, write to the Free |
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15 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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16 ## 02110-1301, USA. |
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17 |
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18 ## -*- texinfo -*- |
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19 ## @deftypefn {Function File} {@var{idx} =} strfind (@var{str}, @var{pattern}) |
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20 ## @deftypefnx {Function File} {@var{idx} =} strfind (@var{cellstr}, @var{pattern}) |
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21 ## Search for @var{pattern} in the string @var{str} and return the |
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22 ## starting index of every such occurrence in the vector @var{idx}. |
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23 ## If there is no such occurrence, or if @var{pattern} is longer |
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24 ## than @var{str}, then @var{idx} is the empty array @code{[]}. |
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25 ## |
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26 ## If the cell array of strings @var{cellstr} is specified instead of the |
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27 ## string @var{str}, then @var{idx} is a cell array of vectors, as specified |
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28 ## above. |
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29 ## @seealso{findstr, strmatch, strcmp, strncmp, strcmpi, strncmpi} |
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30 ## @end deftypefn |
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31 |
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32 ## Author: alois schloegl <a.schloegl@ieee.org> |
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33 ## Created: 1 November 2004 |
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34 ## Adapted-By: William Poetra Yoga Hadisoeseno <williampoetra@gmail.com> |
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35 |
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36 function idx = strfind (text, pattern) |
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37 |
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38 if (nargin != 2) |
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39 print_usage (); |
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40 elseif (! ischar (pattern)) |
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41 error ("strfind: pattern must be a string value"); |
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42 endif |
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43 |
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44 lp = length (pattern); |
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45 |
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46 if (ischar (text)) |
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47 idx = __strfind_string__ (text, pattern, lp); |
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48 elseif (iscellstr (text)) |
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49 idx = cell (size (text)); |
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50 for i = 1:(numel (text)) |
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51 idx{i} = __strfind_string__ (text{i}, pattern, lp); |
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52 endfor |
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53 else |
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54 error ("strfind: text must be a string or cell array of strings"); |
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55 endif |
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56 |
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57 ### endfunction |
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58 |
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59 function idx = __strfind_string__ (text, pattern, lp) |
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60 |
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61 idx = 1:(length (text) - lp + 1); |
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62 k = 0; |
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63 while (k < lp && ! isempty (idx)) |
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64 idx = idx(text(idx + k) == pattern(++k)); |
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65 endwhile |
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66 |
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67 ### endfunction |
