Preg_match_all, get input name attribute values

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I am doing a project with dynamic forms, that is, the user (administrator) can make his own form (HTML/CSS), but when fetching the form from the database I need to check if the names (name) of inputs match the names of the form completed by the end user.

Example of a form stored in the database:

name: <input required name="name" type="text"><br>\r\n
nif: <input name="nif" type="text"><br>\r\n
<input type="submit" value="ENVIAR YO">

I would like to fetch the values of all attributes name, remembering also (as it is not predictable) that both may be stored with "" (name="email") or with '' (name='email'), the regex should cover both cases

php html regex

  • The user writes the HTML, or just gives the name of the fields?

  • Administrator inserts HTML @Papacharlie

  • Would it be something like, "name field html is :"? , it would always be relative to field or it could have "form html"?

  • @Miguel Com regex i think you can do something like this: https://regex101.com/r/sA2sM5/1. Why don’t you use Dom? see: http://ideone.com/xlrXGt

  • Obgado @stderr, I think you should answer, both are correct, you can put both. https://regex101.com/r/sA2sM5/2

1 answer

1


As mentioned in comment, you can in addition to regular expressions, use DOMDocument to represent HTML and get its values.

Assuming you have the following HTML:

<form method="post" action="">
    <input type="hidden" name="produto1" value="teste1">
    <input type="hidden" name='produto2' value="teste2">
    <input name="produto3" type="hidden" value="teste3">
    <input type="hidden" name='produto4' value="teste4">
    <input type="hidden" name="produto5" value="teste5">  

<input type="submit" value="enviar">
</form>

Regular Expression

You can use the following regular expression: input.*(?<=name=['|"])(\w+):

preg_match_all('-input.*(?<=name=[\'|"])(\w+)-', $html, $inputs);

See DEMO

Where:

  • input: Corresponds literally to the word.
  • .*: Any character, except line break.
  • (?<=name=['|"])(\w+): Positive lookbehind. Will match the characters in the range a-zA-Z0-9_ only if preceded by name= and ' or ".

GIFT

With DOMDocument you can use DOMDocument::getElementsByTagName to select all HTML elements when specifying the tag:

$dom = new DOMDocument();
$dom->loadHTML($html);

$inputs = $dom->getElementsByTagName('input');

To return the names of the selected elements use DOMElement::getAttribute:

foreach ($inputs as $input) {
    echo $input->getAttribute('name') . "\n";
}

See DEMO

  • However I managed to go around in another way. But of course this answers and well to the question. Obgado

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