字符替换匹配

多个字符过滤

preg_match:

if(preg_match('/(词1|词2|词3)+/', $string)){
        return false;
}

 str_replace:

$str=str_replace("select","",$str); 

 preg_replace:

$str = preg_replace(array('/深圳市/', '/深圳/'),"",$str);

$string = 'The quick brown fox jumped over the lazy dog.';
$patterns = array();
$patterns[0] = '/quick/';
$patterns[1] = '/brown/';
$patterns[2] = '/fox/';
$replacements = array();
$replacements[2] = 'bear';
$replacements[1] = 'black';
$replacements[0] = 'slow';
echo preg_replace($patterns, $replacements, $string);
?>

以上例程会输出：

The bear black slow jumped over the lazy dog.

ksort($patterns);
ksort($replacements);
echo preg_replace($patterns, $replacements, $string);

以上例程会输出：

The slow black bear jumped over the lazy dog

 PHP学习:字符串操作和正则表达式：http://www.cnblogs.com/xbf321/archive/2011/09/07/string-in-php.html