Let's assume I can have the following strings:

"hey @john..."
"@john, hello"
"@john(hello)"

I am tokenizing the string to get every word separated by a space:

[myString componentsSeparatedByString:@" "];

My array of tokens now contain:

@john...
@john,
@john(hello)

For these cases. How can I make sure only @john is tokenized, while retaining the trailing characters:

...
,
(hello)

Note: I would like to be able to handle all cases of characters at the end of a string. The above are just 3 examples.