Checking if inserted text has numbers
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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?
回答（3 个）
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
>> all(isstrprop('onlyalpha','alpha'))
ans = 1
>> all(isstrprop('1234_+!%%','alpha'))
ans = 0
4 个评论
Grzegorz Czyrski
2017-1-7
Stephen23
2017-1-8
You can put this inside a try-catch statement, but as you don't mention this in your question I have no idea what you are trying to achieve.
Grzegorz Czyrski
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.
José-Luis
2017-1-5
strTrue = 'Abs';
strFalse = '!abs!!!';
expr = '^[A-Za-z]';
a = isempty(regexp(strTrue,expr))
b = isempty(regexp(strFalse,expr))
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2017-1-5
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