Validate only alphanumeric characters in Laravel

问题:

I have the following code in my Laravel 5 app:

public function store(Request $request){
    $this->validate($request, ['filename' => 'regex:[a-zA-Z0-9_\-]']);
}

My intentions are to permit filenames with only alphanumeric characters, dashes and underscores within them. However, my regex is not working, it fails even on a single letter. What am I doing wrong?

回答1:

You need to make sure the pattern matches the whole input string. Also, the alphanumeric and an underscore symbols can be matched with \w, so the regex itself can be considerably shortened.

I suggest:

'regex:/^[\w-]*$/'

Details:

• ^ - start of string
• [\w-]* - zero or more word chars from the [a-zA-Z0-9_] range or -s
• $ - end of string.

Why is it better than 'alpha_dash': you can further customize this pattern.

回答2:

use laravel rule,

    public function store(Request $request){
    $this->validate($request, ['filename' => 'alpha_dash']);
}

Laravel validation rule for alpha numeric,dashes and undescore

回答3:

Might be easiest to use the built in alpha-numeric validation:

https://laravel.com/docs/5.2/validation#rule-alpha-num

$validator = Validator::make($request->all(), [
    'filename' => 'alpha_num',
]);

回答4:

You forgot to quantify the regex, it also wasn't quite properly formed.

public function store(Request $request){
    $this->validate($request, ['filename' => 'regex:/^[a-zA-Z0-9_\-]*$/']);
}

This will accept empty filenames; if you want to accept non-empty only change the * to +.