Anyone know the error checking for special characters

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Vivie
Vivie 2015-4-27
回答： Udit Gupta 2015-4-27
Hello there, I've been at this for a while now but i just can't seem to to find the error check for special characters like, * @!. Please help
  2 个评论
Vivie
Vivie 2015-4-27
i'm writing a simple program that asks the user to enter variables but i'd like to error check it so it's not easily crushed. I've used error checks like isinf, is numeric, isreal. I would like to send the program into a loop should the user use special characters. Does that help.

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回答（1 个）

Udit Gupta
Udit Gupta 2015-4-27
You can use regular expressions. The code will go something like this -
if any(regexp(str,'[^_a-zA-Z0-9]+'))
<error condition>
end
You will need to use a more sophisticated regEx format if you need more robust checking. Like:
if any(regexp(str,'^[a-zA-Z_][a-zA-Z0-9_]*$'))
<valid>
else
<invalid>
end

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