要在[和]之间匹配的正则表达式

<?php
    preg_match( "@\[gallery ([^\]]+)\]@", "foo [gallery GALLERYNAME] bar", $match );
    var_dump( $match );
    // $match[ 1 ] should contain "GALLERYNAME"
?>

<?php
    preg_match_all( "@\[gallery ([^\]]+)\]@m", "
        foo [gallery GALLERYNAME1] bar
        foo [gallery GALLERYNAME2] bar
        foo [gallery GALLERYNAME3] bar
        ", $match );
    var_dump( $match );
    // $match[ 1 ] should contain an array containing the desired matches
?>

\[gallery ([^\]]+)\]

^\[gallery\s([A-Z]+)\]$