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at DocxUtilities.inc

Usage: 

for a pattern of {{{variable_name}}} inside document:

$matches=$newDocx->rawRegExpSearch('file_test.docx', '|{{{([a-zA-Z0-9_]+)}}}|');

and it ouptputs: 

[0].-{{{contract_number}}}
[1].-{{{colaterals}}}
[2].-{{{customer_name}}}

Then I create a html form to fill in the values and generate a new document.

    /**
     * Search and replace text in any XML file of the document. Raw replacement, use carefully
     *
     * @access public
     * @param string $document path to the document
     * @param string $regExp regular expression to match the regex
     * @return array of the value matches
     */
    public function rawRegExpSearch($document, $regExp)
    {
        $docxFile = new ZipArchive();
//         $finalDocument="finalDocumentRawRegExp".uniqid();
        $matches=array();

        // make a copy of the the document into its final destination to don't overwrite it
//         copy($document, $finalDocument);
        // extract (some) of the relevant files of the copy of the first document for manipulation
        $docxFile->open($document);

        $docxNumFiles = $docxFile->numFiles;
        // iterate the ZIP content and replace strings in the XML files
        for ($i = 0; $i < $docxNumFiles; $i++) {
            $fileName = $docxFile->getNameIndex($i);
            $fileExtension = pathinfo($fileName, PATHINFO_EXTENSION);

            if ($fileExtension == 'xml' || $fileExtension == 'rels') {
                // replace the string and save it in the ZIP file
                $fileContent = $docxFile->getFromName($fileName);
                $out=array();
                preg_match_all($regExp, $fileContent, $out);
                if(sizeof($out[0]) > 1)
                array_push($matches, $out[0]);
            }
        }
        $docxFile->close();
        $final=array();
        foreach($matches as $idx => $m)
        if(sizeof($m)>0)
        {
            foreach($m as $k => $v)
            $final[]=$v;
        }
        else
        $final[]=$m;
        return $final;
    }