CODEWITHSUNDEEP
phpregexcakephp
K. Barresi
K. Barresi

Reputation: 1315

CakePHP Validation Regex

I have a quick regex question that I figured someone might know off the top of their head. What would the regex be for CakePHP's validation be if I only want to allow upper/lower alphanumber, spaces, punctuation, and quotes? This is what I have, but it's off:

 'rule' => array('custom', '/[a-z0-9\x20\x21\x2E\x3A\x3B\x3F\x2C\x27\x22]{0,600}/i'),

From what I get, the a-z0-9 covers alphanumeric, but shouldn't the \xXX cover the punctuation with the ASCII hex codes? And then the {0,600] means a length of 0-600 characters, and i means upper and lower. What am I missing?

For example: valid: This is a "valid text", which contains ' and punctuation!

invalid: This is an obvious XSS attempt

Upvotes: 3

Views: 3518

Answers (2)

Jack
Jack

Reputation: 5768

^([\d\w\s?!\.;:,'"\/\[\]\(\)=\+-]*)$

should work? You should provide examples of what texts you consider to be valid and which are invalid.

preg_match('/^([\d\w\s?!\.;:,'"\/\[\]\(\)=\+-]*)$/', $string);

Upvotes: 3

Dan Janssen
Dan Janssen

Reputation: 11

As long as you know you want it to be ASCII, just use the character ranges

$input = "this is a \n string\n";
echo preg_match("/^[ -~]{0,600}$/", $input);  // output is 0 (false)
$input = "this is a string";
echo preg_match("/^[ -~]{0,600}$/", $input);  // output is 1 (true)

Whenever I deal with ASCII I find the specific ranges much easier. So basically you want the start of the string to be anything within a space and ~, which are all visible characters. And then you have a 0-600 character limit, and $ signifies the end of the string

Upvotes: 1

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