Replace text except in divs of a class with regular expression

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Replace text except in divs of a class with regular expression

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#1 by (2 votes)

1

I need a regular expression that replaces a text that is outside a certain div.

Example:

<div class="try">foo</div>
<div>foo</div>
foo
<span>foo</span>

The output should be when replacing foo by bar:

<div class="try">foo</div>
<div>bar</div>
bar
<span>bar</span>

link

php regex

asked by Bicu 25.03.2017 в 13:36

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1 answer

Is it possible for a button to add a tag to a textarea without erasing the content? Problem with PHP recursion

score 2 · Answer 1

You should not use regular expressions to process HTML. Just a small change in the HTML would make your regex fail. A space of more, a change in the attributes of the tag, a comment, or more complex structures, would make even a gigantic regex not follow the rules.

It's very easy to process HTML with DOM , they are the tools that They are designed for that.

The DOM is simply generated as follows:

//Ingreso
$html = '
<div class="try">foo</div>
<div>foo</div>
foo
<span>foo</span>'

//Generar el DOM
$doc = new DOMDocument;
$doc->loadHTML($html, LIBXML_COMPACT | LIBXML_NONET);

Taking the body of the generated document:

$body = $doc->getElementsByTagName('body')->item(0);

And we can go through all the child nodes:

foreach ($nodoDOM->childNodes as $nodo) {

Replacing text nodes:

if ($nodo->nodeType == XML_TEXT_NODE) {
    $nodo->nodeValue = str_ireplace( $buscar, $reemplazo, $nodo->nodeValue);
}

Or recursively looking at nodes that do not have the class "try" :

if( !$nodo->hasAttributes()
 || !in_array("try", explode(" ", $nodo->getAttribute("class"))) ) {

Code

<?php

//Ingreso
$html = '
<div class="try">foo</div>
<div>foo</div>
foo
<span>foo</span>';

echo "TEXTO ORIGINAL:" . $html;


//Generar el DOM
$doc = new DOMDocument;
$doc->loadHTML($html, LIBXML_COMPACT | LIBXML_NONET);
$body = $doc->getElementsByTagName('body')->item(0);


//Reemplazar recursivamente
$html = buscarNodoDOM($body, "foo", "bar", "try");

function buscarNodoDOM(DOMNode $nodoDOM, $buscar, $reemplazo, $claseProhibida, $recursivo = false) {
    $resultado = "";

    //recorrer todos los nodos
    foreach ($nodoDOM->childNodes as $nodo) {

        if ($nodo->nodeType == XML_TEXT_NODE) {
            //Si es un nodo de texto, reemplazar
            $nodo->nodeValue = str_ireplace( $buscar, $reemplazo, $nodo->nodeValue);
        } elseif(( !$nodo->hasAttributes() || !in_array($claseProhibida, explode(" ", $nodo->getAttribute("class"))) )
              && $nodo->hasChildNodes()) {
            //si no es de la clase prohibida, y tiene hijos, recorrer todos los hijos
            buscarNodoDOM($nodo, $buscar, $reemplazo, $claseProhibida, true);
        }

        if (!$recursivo) {
            //si estamos en el body, agregar todo el HTML del nodo al resultado
            $resultado .= $nodoDOM->ownerDocument->saveHTML($nodo);
        }
    }
    //devolver el HTML como texto
    return $resultado;
}



//Mostrar resultado
echo "\n\nTEXTO MODIFICADO:\n" . $html;

Result:

TEXTO ORIGINAL:
<div class="try">foo</div>
<div>foo</div>
foo
<span>foo</span>

TEXTO MODIFICADO:
<div class="try">foo</div>
<div>bar</div>
bar
<span>bar</span>

Demo:

Watch the demo at 3v4l.org