I am getting the error "Variable y must be of data type char. It is currently of type double."

I am getting the error "Variable y must be of data type char. It is currently of type double. Function should return with a character vector conataining only the email address." I'm not sure how to fix it please help.

function result = extractemail(input)

text = regexp(input,'[a-zA-Z0-9_.-]+@[a-zA-Z0-9_-]+.[a-z]+');

email = regexp(input,'[a-zA-Z0-9_.-]+@[a-zA-Z0-9_-]+.[a-z]+','match');

if(numel(text)==1)

result = char(email)

else

result = []

end

end

CODE TO CALL FUNCTION

result = extractemail('My email address is: [e-mail] so please email me');

OUTPUT

result =

'[e-mail]'

Answer 1

[Stephen23]

extractemail('My email address is: [e-mail] so please email me')

ans = '[e-mail]'

extractemail('There is no email here')

ans =

  0×0 empty char array

function txt = extractemail(input)
rgx = '[a-zA-Z0-9_.-]+@[a-zA-Z0-9_-]+.[a-z]+';
txt = regexp(input,rgx,'match','once');
end

Note that defining a regular expression to match valid email adresses is not trivial (or perhaps solvable):

https://www.regular-expressions.info/email.html

https://stackoverflow.com/questions/201323/how-can-i-validate-an-email-address-using-a-regular-expression

https://www.mathworks.com/matlabcentral/fileexchange/108114-validateemail