Question 17436 in Laravel Question posted in
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Rule validation for string length in Laravel

I need to validate a string whose length is exactly 6 OR 8. How could I make the rule for this validation?

The number must be 6 OR 8, it cannot be between 6 and 8.

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3

Answers


  1. 0

    You need to create a custom rule.

    In the sample below, I used the Closure to create a custom rule, but you can create a rule object to reuse it.

    I used the mb_strlen instead of strlen to cover multibyte. (UTF8 chars)

    use IlluminateSupportFacadesValidator;
use IlluminateHttpRequest;

Route::get('/test', function (Request $request) {
    $validator = Validator::make($request->all(), [
        'title' => [
            'required',
            function ($attribute, $value, $fail) {
                if (!(mb_strlen($value) == 8 || mb_strlen($value) == 6))
                {
                    $fail('The ' . $attribute . ' is invalid.');
                }
            },
        ],
    ]);

    dd($validator->errors());
});
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  2. 0

    Try saving string length first and then check with if conditions.

    $str = “hellowld”;
$len = strlen($str);
If($len == 6 || $len == 8)
    //do something 
Else
    //throw error

    or use regex validation rule for length as:

     /^[68]+$/

    For string length.

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  3. 0

    You don’t actually need to make your own validator, since Laravel’s validation comes with a regex validation rule, so you could just do:

    [
    ...
    'parameter' => 'regex:/^(.{6}|.{8})$/g',
    ...
]

    Regex stolen and adapted from here but you can test it here

    Regex Explanation:

    ^    # Start of string
(    # Start capture group
.    # Matches any character except line breaks
{6}  # Quantifier that only matches 6 preceding tokens (.)
|    # OR operator
.    # Matches any character except line breaks
{8}  # Quantifier that only matches 8 preceding tokens (.)
)    # End capture group
$    # End of string

    OLD ANSWER (unnecessarily complicated)

    [
    ...
    'parameter' => 'regex:/^(?=.*$)(?:.{6}|.{8})$/g',
    ...
]

    Regex Explanation:

    ^    # Start of string
(?=  # Start of positive lookahead
.*   # Matches any character except line breaks 0 or more times
$    # End of string
)    # End of positive lookahead
(?:  # Start of non-capturing group
.{6} # Matches any character except line breaks exactly 6 times
|    # OR operator
.{8} # Matches any character except line breaks exactly 8 times
)    # End non-capturing group
$    # End of string
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