正則表達式例子：獲得某個網頁上的所有超褳接
<html>
<head><title>正則表達式</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 $url?>"><input type="submit" value="獲取所有褳接">
</form>
<?
if(isset($url)){
echo "$url 有下列褳接：<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>
<head><title>正則表達式</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 $url?>"><input type="submit" value="獲取所有褳接">
</form>
<?
if(isset($url)){
echo "$url 有下列褳接：<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>