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Das geht auch ohne Regex:

<?php
## file: SelectOneOffAcceptedLanguages.php
function SelectOneOffAcceptedLanguages ( $arList, $showDebug = 0) {

    ## accept a array of languages (strings) (e.g. array('de', 'en-US', 'en', 'fr')) as first argument
    ## returns, if in $arList, the accepted language with the highest quota from $_SERVER['HTTP_ACCEPT_LANGUAGE']
    ## if not a accepted language in $arList, return the fist Element in $arList
    ## if debug set this will echo debug-informations

    ## show ISO 639-1 and  RFC 1766 for more Informations
    ## rfc2616 section 14 for the HTTP_ACCEPT_LANGUAGE-Header

    $arTmp = array();
    foreach ($arList as $s) {
        $s=trim($s);
        if ($s) {
            $arTmp[] = strtolower($s);
        }
    }
    $arList = $arTmp;
    $arAcceptedLanguages = array();
    $arTmp = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
    foreach ($arTmp as $item) {
        $arLangQuote = array();
        $arLangQuote = explode(';', $item);
        if (! isset($arLangQuote[1]) ) {
            $arLangQuote[1] = 1;
        }
        $arLangQuote[0] = trim( $arLangQuote[0] );
        if ( $arLangQuote[0] ) {
            $arT['quote'] = floatval( trim( str_replace( 'q=', '', $arLangQuote[1] ) ) );
            $arT['lang']  = strtolower($arLangQuote[0]);
            $arAcceptedLanguages[] = $arT;
        }
    }
    if ($showDebug) { print_r($arAcceptedLanguages); }

    $retLang = $arList[0];
    $SelectedLanguage = $arList[0];
    $quote = 0;
    foreach ( $arList as $lang ) {
        $lang  = trim( $lang );
        foreach ($arAcceptedLanguages as $arTmp) {
            if ($showDebug) { echo "Test: $lang == " . $arTmp['lang'] . ' && ' . $arTmp['quote'] . " > $quote\n"; }
            if ( $lang == $arTmp['lang'] && $arTmp['quote'] > $quote ) {
                $retLang = $arTmp['lang'];
                $quote   = $arTmp['quote'];
                if ($showDebug) { echo "Winner is: " . $arTmp['lang'] . "( Quote: " . $arTmp['quote'] . ")\n"; }
            }
        }
    }
    return $retLang;
}


#/* Test ( To disable the test remove the first '#' in this line. On production systems delete all the stuff downside this line)
## Values to edit:
## Present Languages, comma-separated, try with errors (lower, upper, spaces):
$list="fr, en, es";
$showDebug = true;

# Overwrite
## Simulate the HTTP_ACCEPT_LANGUAGE - header,  try with errors (lower, upper, spaces):
$HttpAcceptLanguage="de-DE,de ;q=0.8, en-US;q=0.5,en;q=0.3";
#$HttpAcceptLanguage=false;

if ($HttpAcceptLanguage) {
    $_SERVER['HTTP_ACCEPT_LANGUAGE']=$HttpAcceptLanguage;
}

if (! isset( $_SERVER['HTTP_ACCEPT_LANGUAGE'] ) ) {
    echo "\n\nTest: Settings Error: You have not set a \$HttpAcceptLanguage and \$_SERVER knows nothing about this... - Nothing to test. Exit!\n\n";
    exit;
}

##Program:
header('Content-Type: text/plain');
echo "\n\nTest of " . __FILE__  . "\n Accepted: " . $_SERVER['HTTP_ACCEPT_LANGUAGE'] . "\n Present: $list\nselected: " . SelectOneOffAcceptedLanguages( explode( ',', $list), $showDebug ) . "\n\n";
# */

Ich hoffe ja, dass der Beitrag nicht von @1unitedpower mit der Begründung gelöscht wird, dass die "Sicherheit nicht nachgewiesen" sei und weil @1unitedpower a) nicht durchsieht und b) nicht mit automatisierten Tests darauf ballern kann.