正则表达式踢出PHP preg_match if条件中的HTML文本区域输入 - Regular Expressions kicking out HTML textarea input in PHP preg_match if condition

Regular Expressions kicking out HTML textarea input in PHP preg_match if condition

我不知道为什么我的PHP代码preg_match不接受来自HTML文本区域的输入，因为它有括号或返回：

以下是相关的PHP:

/* Check for Ingredient Description */
if (preg_match ('%^'s*[A-Za-z0-9','.'' '-'"'(')]{30,2048}$%', stripslashes(trim($_POST['ingredient_descrip'])))) 
{
   $idscr = escape_data($_POST['ingredient_descrip']);
} 
else 
{
   $idscr = FALSE;
   echo '<p><font color="red" size="+1">
      Please enter an ingredient description!</font></p>';
}

自定义函数escape_data如下所示：

$dbc = mysql_connect (DBHOST, DBUSER, DBPW)
function escape_data ($data) 
{   
if (function_exists('mysql_real_escape_string')) 
{
    global $dbc; 
    // Need the connection.
    $data = mysql_real_escape_string (trim($data), $dbc);
    $data = strip_tags($data);
} 
else 
{
    $data = mysql_escape_string (trim($data));
    $data = strip_tags($data);
}
// Return the escaped value.    
return $data;
}

以下是调用文本区域输入的相关HTML：

<form action="ingredient_form.php" method="post" enctype="multi-part/form-data">
<fieldset>
<p><b>Ingredient Description:</b></p> 
    <p><textarea cols="100" rows="20" name="ingredient_descrip"></textarea><?php if (isset($_POST['ingredient_descrip'])) echo $_POST['ingredient_descrip']; ?></p>

</fieldset>
<div align="center"><input type="submit" name="submit" value="Submit Proposed Ingredient Profile" /></div>
<input type="hidden" name="submitted" value="TRUE" />

我尝试删除preg_match，只接受文本区域输入，然后使用preg_replace函数重新获得格式并使用以下代码进行测试：

if ($_POST['ingredient_descrip']) 
{
$idscr = stripslashes(trim($_POST['ingredient_descrip']));
echo "<p>" .$idscr. "</p>";
$idscr = escape_data($idscr);
echo "<p>" .$idscr. "</p>";
$idscrp = preg_replace("/['r'n]+/", "<br />", $idscr);
echo "<p>" .stripslashes($idscrp). "</p>";
}

preg_replace似乎也没有发挥作用。出于测试目的，我将其放入文本区域：

This is a (test)
Why isn't it working?
but

我的回波结果返回为：

This is a (test) Why isn't it working? but
This is a (test) 'r'nWhy isn''t it working? 'r'nbut
This is a (test) rnWhy isn't it working? rnbut

preg_replace应该用break替换''r''n，然后stripestrash应该去掉转义符中的剩余字符。我错过了什么？

使用nl2br（）用<br />标记替换新行，而不是尝试用preg_replace()重新发明轮子。

也就是说，你的preg_replace()呼叫对我有效：

$str = <<<STR
foo
bar
baz
STR;
var_dump($str);
$str = preg_replace("/['r'n]+/", "<br />", $str);
var_dump($str);

输出：

string(11) "foo
bar
baz"
string(21) "foo<br />bar<br />baz"