preg_has_match:
{preg_has_match( "I just want to say: hi", "/hi/" )}

preg_match:
{var $a = preg_match( "Hello world", "/^.*$/" )}{$a[0]}

preg_replace:
{$a = preg_replace( "Hello world", "/.ello/", "Hi")}{$a}

preg_quote:
{ preg_quote( "(bla)?" ) }

preg_split:
{ $a = preg_split( "Hello world", "/\s/" )}{$a[1]} {$a[0]}

preg_grep:
{var $in = array("Hello", "world" )}{var $out = preg_grep($in, "/orld/" )}{$out[1]}