Anyone know the error checking for special characters

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

[Adam]

in what context?

[Vivie]

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.

Answer 1

[Udit Gupta]

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