Search string for special characters
45 ビュー (過去 30 日間)
古いコメントを表示
Hi all,
I have a program that saves and loads data to and from a .mat file. Currently the UIPUTFILE and save function method I am using allows the user to save files with special characters. They then cannot load this file again. The most common issue is users saving the file with a period.
How can I search the string for special characters? I want to throw up an error message if the user tries to save the file with a filename that MATLAB will not be able to load with UIGETFILE and the load function.
I have tried regexp but I am struggling to make it do what I want, even using backslashes in front of the characters in places.
if ~isempty(regexp(filename, '[/\*:?"<>|!]'))
uiwait(msgbox('Filename contains illegal characters.' 'Filename Error','error','modal'));
else
save(SavePath,'DataStructure');
end
Thanks,
Matt
3 件のコメント
Milos Matovic
2020 年 11 月 11 日
Matt, your code works for me and it covers all invalid chars for file names as specified by Windows.
Only change i made is added a double backslash because it is a escape character so regular expression was not accounting for it.
if ~isempty(regexp(filename, '[/\\*:?"<>|!]'))
採用された回答
Stephen23
2017 年 9 月 8 日
編集済み: Stephen23
2017 年 9 月 8 日
It is invariably easier to build a short list of the permitted characters than an long (and most likely incomplete) list of forbidden characters (trust me, there are more characters out there than you would believe).
Adapt this to your list of "permitted characters":
>> rgx = '^[\w-]+\.[\w]+$';
>> regexp('okayname.txt',rgx)
ans = 1
>> regexp('bad()nam!e.txt',rgx)
ans = []
I know that it can be a challenge to create a working regular expression, and so to help with this I wrote a tool iregexp that you can download from MATLAB FEX:
It lets you try different parse and match string combinations, and shows regexp's outputs in real time as you type.
0 件のコメント
その他の回答 (2 件)
Pal Szabo
2017 年 9 月 8 日
Can't you use strrep? You can replace the special characters with something which works. https://uk.mathworks.com/help/matlab/ref/strrep.html
Matt
2017 年 9 月 8 日
1 件のコメント
Stephen23
2017 年 9 月 8 日
編集済み: Stephen23
2017 年 9 月 8 日
Some notes:
- Do not do this, it is an unreliable and obfuscated way to remove a file extension:
file_without_extension = file(1:(length(file)-4))
Instead simply use fileparts: it is simpler and correct for any length extension.
- \s matches all whitespace characters. Do you really want vertical tab in your filenames?
参考
カテゴリ
Help Center および File Exchange で Environment and Settings についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!