regex_match and accented characters

You need to add u for unicode.

Code:

/^[\w\-\.@]{1,30}$/u

Personally I use these two:

Code:

$config['error_alpha_numeric_spaces_dash'] = '/^[\w\s-_]+/u';
$config['error_alpha_numeric_spaces_dash_colon'] = '/^[\w\s:-_]+/u';

And use min_length[1] and max_length[30] instead of limiting the regular expression. So that I can re use it later.