Checking if inserted text has numbers

1 次查看（过去 30 天）
Grzegorz Czyrski
Grzegorz Czyrski 2017-1-5
编辑： Stephen23 2017-1-9
Hello there. I need to build a program, where an user inserts its name in the dialog box. But the inserted text cannot have numbers or any special symbols. How may program check that and show an information to user?

请先登录，再回答此问题。

回答（3 个）

Niels
Niels 2017-1-6
in my opinion the easiest way would be
all(isletter(expressionString))
>> all(isletter('haj%kj'))
ans =
logical
0
>> all(isletter('hajkj'))
ans =
logical
1
Stephen23
Stephen23 2017-1-5
编辑：Stephen23 2017-1-5
Use isstrprop:
>> all(isstrprop('onlyalpha','alpha'))
ans = 1
>> all(isstrprop('1234_+!%%','alpha'))
ans = 0
  4 个评论
显示 2更早的评论
Grzegorz Czyrski
Grzegorz Czyrski 2017-1-9
It goes like this: you click on a button named "load patient", then a new window shows up, where you have to wirte its name. And I just want to prevent user from inserting symbols and numbers.
Stephen23
Stephen23 2017-1-9
编辑：Stephen23 2017-1-9
I wouldn't use a try - catch for that. That is a bit brutal. Just put the code in a for-loop and break out of the loop when the user enters valid input. The for loop should have five or so iterations, after which you can conclude that the user is not interested in supplying valid data anyway so you might as well terminate the code.

请先登录，再进行评论。

José-Luis
José-Luis 2017-1-5
strTrue = 'Abs';
strFalse = '!abs!!!';
expr = '^[A-Za-z]';
a = isempty(regexp(strTrue,expr))
b = isempty(regexp(strFalse,expr))

类别

在 Help Center 和 File Exchange 中查找有关 Symbolic Math Toolbox 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by