例如在对如何下的html进行替换：<div class="abc">
<a href="#a">go to a</a>
<img src="images/a.gif" alt="this is image a" />
<p>
<span>caption</span>
<span class="content">application</span>
</p>
</div>
我希望把所有的字母A全部进行加粗显示，但又不能影响到html的显示结果，正确的结果如下：<div class="abc">
<a href="#a">go to <b>a</b></a>
<img src="images/a.gif" alt="this is image a" />
<p>
<span>c<b>a</b>ption</span>
<span class="content"><b>a</b>ndroid <b>a</b>pplication</span>
</p>
</div>
<a href="#a">go to a</a>
<img src="images/a.gif" alt="this is image a" />
<p>
<span>caption</span>
<span class="content">application</span>
</p>
</div>
我希望把所有的字母A全部进行加粗显示，但又不能影响到html的显示结果，正确的结果如下：<div class="abc">
<a href="#a">go to <b>a</b></a>
<img src="images/a.gif" alt="this is image a" />
<p>
<span>c<b>a</b>ption</span>
<span class="content"><b>a</b>ndroid <b>a</b>pplication</span>
</p>
</div>
$str = '<div class="abc">
<a href="#a">go to a</a>
<img src="images/a.gif" alt="this is image a" />
<p>
<span>caption</span>
<span class="content">application</span>
</p>
</div>
';$tempStr = str_replace("<","||<",$str); //在html标签前加上分割符||(分割符根据实际情况更改)
$tempStr = strip_tags($tempStr); //得到去html标签的字符窜
$strArray = explode('||', $tempStr); //将字符窜按分割符进行分割foreach($strArray as $v)
{
$tempStr = str_replace('a', '<b>a</b>', $v); //替换a为<b>a</a>
$str = str_replace($v, $tempStr, $str); //替换原字符每个html标签内容
}echo $str;
<div class="abc">
<a href="#a">go to a</a>
<img src="images/a.gif" alt="this is image a" />
<p>
<span>caption</span>
<span class="content">Application</span>
</p>
</div>
STR;$reg = '/<.+?>.+<.+?>/i';preg_match_all($reg, $str, $array);$array = array_unique($array[0]);$len = count($array);for($i = 0;$i < $len;$i++)
{
preg_match('/<.+?>(.+)<.+?>/i', $array[$i], $a);
$inner = preg_replace('/(a)/i','<b>\1</b>', $a[1]);
$outer = preg_replace('/(<.+?>).+(<.+?>)/i', '\1' . $inner . '\2', $a[0]);
$str = str_replace($a[0], $outer, $str);
}echo $str;
<div class="abc">
<a href="#a">go to a<div>go to span</div></a>
<a><div>这是一a个测试</div></a>
<img src="images/a.gif" alt="this is image a" />
<p>
<span>caption</span>
<span class="content">Application</span>
</p>
</div>
STR;function getTag(&$html, &$pos, $len)
{
$sp = $pos;
$rs = '<';
$pos++;
$c = $html[$pos];
while(true)
{
if($c === '<')
{
$pos = $sp;
return false;
}
$rs .= $c;
$pos++;
if($pos >= $len)
{
return false;
}
$c = $html[$pos];
if($c === '>')
{
break;
}
} $rs .= '>'; return $rs;
}function replace($html)
{
$len = strlen($html); $rs = '';
$pos = 0;
$c = $html[$pos];
while(true)
{
if($c === '<')
{
$gr = getTag($html, $pos, $len);
if($gr !== false)
{
$rs .= $gr;
}
}
else if($c === 'a' || $c === 'A')
{
$rs .= '<b>' . $c . '</b>';
}
else
{
$rs .= $c;
} $pos++;
if($pos >= $len)
{
break;
}
$c = $html[$pos];
} return $rs;
}$str = replace($str);echo $str;
<?php
$str = 'A<div class="abc">
<a href="#a">go to a</a>
<img src="images/a.gif" alt="this is image a" />
<p>
<span>caption</span>
<span class="content">application</span>
</p>
</div>aa
';
$str = preg_replace_callback('/(?<=^|>).+(?=<|$)/U',create_function('$ms','return preg_replace("/a/i","<b>$0</b>",$ms[0]);'),$str);echo $str;
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="generator" content="editplus" />
<meta name="author" content="JnKc" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<style type="text/css">
*{font-size:22px;}
</style>
</head>
<body>
<div class="abc">
<a href="#a">go to a</a>
<img src="images/a.gif" alt="this is image a" />
<p>
<span>caption</span>
<span class="content">application</span>
</p>
</div>
</body>
</html>
<script type="text/javascript">
document.body.innerHTML = document.body.innerHTML.replace
(/(>)([^<]+)(<)/gim,
function f2c($0,$1,$2,$3){
return($1+$2.replace(/a/gim,'<b>a</b>')+$3);
}
);
</script>