正则表达式例子：获得某个网页上的所有超裢接
<html>
<head><title>正则表达式</title></head>
<body>
<a href="./">返回列表</a><br>
<form action="<?echo $PHP_SELF;?>" method="post">
URL：<input type="text" name="url" value="<?echo $url?>"><input type="submit" value="获取所有裢接">
</form>
<?
if(isset($url)){
echo "$url 有下列裢接：<br>";
$fcontents = file($url);
while(list(,$line)=each($fcontents)){
while(eregi((href[[:space:]]*=[[:space:]]*"?[[:alnum:]:@/._-]+"?)(.*),$line,$regs)){
$regs[1] = eregi_replace((href[[:space:]]*=[[:space:]]*"?)([[:alnum:]:@/._-]+)("?),"\2",$regs[1]);
echo " $regs[1]<br>";
$line = $regs[2];
}
}
}
?>
</body>
</html> ;
