preg_match_all 全局正则表达式匹配
preg_match_all 正规表达式中的/..../uis u i s 是有什么用
/u 表示按unicode(utf-8)匹配（主要针对多字节比如汉字）
/i 表示不区分大小写（如果表达式里面有 a， 那么 A 也是匹配对象）
/s 表示将字符串视为单行来匹配
$data ='
DDDdd
ee
ffggg';
preg_match_all("/
print_r($matches);
# additionally, wrap the text an $p_wrap character intervals if the config is set
function string_nl2br( $p_string, $p_wrap = 100 ) {
$output = '';
$pieces = preg_split( '/(
if( isset( $pieces[1] ) ) {
foreach( $pieces as $piece ) {
if( preg_match( '/(
$piece = preg_replace( "/
# @@@ thraxisp - this may want to be replaced by html_entity_decode (or equivalent)
# if other encoded characters are a problem
$piece = preg_replace( "/ /", " ", $piece );
if( ON == config_get( 'wrap_in_preformatted_text' ) ) {
$output .= preg_replace( '/([^n]{' . $p_wrap . '})(?!)/', "$1n", $piece );
} else {
$output .= $piece;
}
} else {
$output .= nl2br( $piece );
}
}
return $output;
} else {
return nl2br( $p_string );
}
}
