preg_replace在一个句子中的"Word"和"Word".在一个句子的结尾

Question

我想在PHP中preg_replace"Word".

    $ret = 'I gave my Word to you.';    
    $pattern = '/\bWord\b/i';
    $ret = preg_replace($pattern,"Heart",$ret);
// echo $ret; = "I gave my Heart to you";

这项工作到目前为止.但如果这句话是"我给了你我的话".或者"我给了你我的话!" 它不会改变"Word".进入"心脏".

Answer 1

不确定是什么问题.适合我.

<?
    $ret = 'I gave my Word to you Word.';
    $pattern = '/\bWord\b/i';
    $ret = preg_replace($pattern,"Heart",$ret);
    var_dump($ret);
?>

string(29)"我把心交给了你."