Comment ajouter une balise d'ancrage à une URL à partir de la saisie de texte

Voici mon code pour formater tous les liens à l'intérieur du texte, y compris les courriels, les URL avec et sans protocole.

public function formatLinksInText($text)
{
    //Catch all links with protocol      
    $reg = '/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,}(\/\S*)?/'; 
    $formatText = preg_replace($reg, '<a href="$0" style="font-weight: normal;" target="_blank" title="$0">$0</a>', $text);

    //Catch all links without protocol
    $reg2 = '/(?<=\s|\A)([0-9a-zA-Z\-\.]+\.[a-zA-Z0-9\/]{2,})(?=\s|$|\,|\.)/';
    $formatText = preg_replace($reg2, '<a href="//$0" style="font-weight: normal;" target="_blank" title="$0">$0</a>', $formatText);

    //Catch all emails
    $emailRegex = '/(\S+\@\S+\.\S+)\b/';
    $formatText = preg_replace($emailRegex, '<a href="mailto:$1" style="font-weight: normal;" target="_blank" title="$1">$1</a>', $formatText);
    $formatText = nl2br($formatText);
    return $formatText;
}

J'ai une petite mise à jour de la réponse acceptée qui fonctionne également pour des liens sans protocole (liens sans http (s): //) - avant d'être liés mais comme des liens relatifs qui ne fonctionnaient pas.

J'ai également ajouté quelques commentaires pour la documentation. P>

/**
 * Replace links in text with html links
 *
 * @param  string $text Text to add links to
 * @return string Text with links added
 */
function auto_link_text( $text )
{
    $pattern = "#\b((?:https?:(?:/{1,3}|[a-z0-9%])|[a-z0-9.\-]+[.](?:com|net|org|edu|gov|mil|aero|asia|biz|cat|coop|info|int|jobs|mobi|museum|name|post|pro|tel|travel|xxx|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cs|cu|cv|cx|cy|cz|dd|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|Ja|sk|sl|sm|sn|so|sr|ss|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)/)(?:[^\s()<>{}\[\]]+|\([^\s()]*?\([^\s()]+\)[^\s()]*?\)|\([^\s]+?\))+(?:\([^\s()]*?\([^\s()]+\)[^\s()]*?\)|\([^\s]+?\)|[^\s`!()\[\]{};:'.,<>?«»“”‘’])|(?:(?<!@)[a-z0-9]+(?:[.\-][a-z0-9]+)*[.](?:com|net|org|edu|gov|mil|aero|asia|biz|cat|coop|info|int|jobs|mobi|museum|name|post|pro|tel|travel|xxx|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cs|cu|cv|cx|cy|cz|dd|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|Ja|sk|sl|sm|sn|so|sr|ss|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)\b/?(?!@)))#";
    return preg_replace_callback( $pattern, function( $matches ) {
        $url = array_shift( $matches );

        // force http if no protocol included
        if ( !startsWith( $url, 'http' ) ) {
            $url = 'http://' . $url;
        }

        // make link text from url - removing protocol
        $text = parse_url( $url, PHP_URL_HOST ) . parse_url( $url, PHP_URL_PATH );
        
        // remove the www from the link text
        $text = preg_replace( "/^www./", "", $text );

        // remove any long trailing path from url
        $last = -( strlen( strrchr( $text, "/" ) ) ) + 1;
        if ( $last < 0 ) {
            $text = substr( $text, 0, $last ) . "&hellip;";
        }

        // update 
        return sprintf(
            '<a rel="nowfollow" target="_blank" href="%s">%s</a>', 
            $url, 
            $text
        );
    }, $text );
}

/**
 * Check strings for starting match
 *
 * @param  string $string String to check.
 * @param  string $startString Startin string to match.
 * @return boolean Wether string begins with startString. 
 */
function startsWith( $string, $startString ) 
{ 
    $len = strlen($startString); 
    return (substr($string, 0, $len) === $startString); 
}