使用php在正则表达式中查找baseDomain

Question

What i wanted to do is to search for $BaseDomain if it exist within the link match by regex and if true no need of opening the link in another tap. I also tried using $replacePattern1 instead of $1 and $replacePattern2 instead of $2. The target = _blank is never appended to the href when the the link is not the $BaseDomain. Please where am i wrong?

function ReplaceUrlToHtmlLink($source) {
           /// my site name ///
            $BaseDomain = "ivotism.com";
    //URLs starting with http://, https://, or ftp://
    $replacePattern1 = '/(\b(https?|ftp):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/i';
    $source =  preg_replace($replacePattern1, '<a href="$1" ' . (strpos('$1', $BaseDomain) !== false ?
                    ' target="_blank"' : '') . '>$1</a>', $source);

    //URLs starting with "www." (without // before it, or it'd re-link the ones done above).
    $replacePattern2 = '/(^|[^\/])(www\.[\S]+(\b|$))/i';
    $source =  preg_replace($replacePattern2, ' <a href="http://$2" ' . (strpos('$2', $BaseDomain) !== false ?
                    ' target="_blank"' : '') .'>$2</a>', $source);

    //Change email addresses to mailto:: links.
    $replacePattern3 = '/(([a-zA-Z0-9\-\_\.])+@[a-zA-Z\_]+?(\.[a-zA-Z]{2,6})+)/i';
    $source =  preg_replace($replacePattern3, '<a href="mailto:$1">$1</a>', $source);
     return $source;
}

Answer 1

Use === true in all your tests. Because !== false work also for 0.

But it is not possible to use $1 (or $n) in other function, even in the same line argument.

Use:

function ReplaceUrlToHtmlLink($source) {
    /// my site name ///
        $BaseDomain = "ivotism.com";    // or "ivotism\.com"

    //URLs starting with http://, https://, or ftp://
    $replacePattern1 = '/(\b(https?|ftp):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/i';
    $source =  preg_replace($replacePattern1, '<a href="$1" target="_blank">$1</a>', $source);

    //URLs starting with "www." (without // before it, or it'd re-link the ones done above).
    $replacePattern2 = '/(^|[^\/])(www\.[\S]+(\b|$))/i';
    $source =  preg_replace($replacePattern2, ' <a href="http://$2" target="_blank">http://$2</a>', $source);

    //Change link with domain.
    $replacePattern3 = '/(<a href="[^"]+'. $BaseDomain .'[^"]*") target="_blank">/i';
    $source =  preg_replace($replacePattern3, '$1>', $source);

    //Change email addresses to mailto:: links.
    $replacePattern4 = '/(([a-zA-Z0-9\-\_\.])+@[a-zA-Z\_]+?(\.[a-zA-Z]{2,6})+)/i';
    $source =  preg_replace($replacePattern4, '<a href="mailto:$1">$1</a>', $source);
     return $source;
}