I'm using the filter validate regexp like this:
filter_input(INPUT_POST, 'nome', FILTER_VALIDATE_REGEXP, array("options" => array("regexp" => "/.[a-zA-ZÀ-ú\s]+$/"))
The validation works, the strange thing is that if I put only one letter in the form field, it slashes. For example: If I put only "a" it slashes, but if I put "aa" it works. Only from two letters does it validate.
It is because of . at the beginning, which is considered the search for "one character" and more [a-zA-ZÀ-ú\s]+ , which would be the second or more characters, see the difference:
Also do not forget ^ so that it requires the string to start and end (with $ ) exactly as the regex defines, otherwise it will only require it to finish, but the beginning can have any input format
Enjoy and also add the change i , to case-insensitive, so you will not need A-Z and a-z, it looks like this: /^[a-zà-ú\s]+$/i
Then switch to:
filter_input(INPUT_POST, 'nome', FILTER_VALIDATE_REGEXP, array("options" => array("regexp" => "/^[a-zà-ú\s]+$/i"))
Note that for
unicode, if you are using UTF-8 for example, you may have to use theumodifier, like this:/^[a-zà-ú\s]+$/iu