preg_match不接受新行

Question

I know it sounds a little strange, but I'll try to explain.
use this code to check if $text contains unsupported characters:

if(!preg_match('/\A[\w .,]+\z/', $text))
{
    echo "Text contains unsupported characters.";
}

Now the problem is that $text is the text entered by the user in textarea.

$text_c = $_POST['text'];
$text = mysql_real_escape_string($text_c);
echo "<form method='post'><textarea name='text'>".$text."</textarea><br /><input type='submit' name='submit' value='Submit'></form>";

Everything works perfectly, except one thing. Example, if this is text entered in textarea:

Hello, my name is John.

OK.

Hello, my name is John.
I am 20 years old.

NO. Text contains unsupported characters. (refers to the new line, because content of the textarea change and have something like: My name is John.\\r\\nI am 20 years old. )

My question is: what I need to change to support new lines? I hope you understand.

EDIT: I just discovered, without mysql_real_escape_string everything works exactly as I want. Is there any solution to "combine" mysql_real_escape_string with preg_match (in my case) or mysql_real_escape_string supposed to drop?

Answer 1

You can use \\s to represent whitespace (new lines, tabs and spaces).

So your regex becomes: /\\A[\\w .,\\s]+\\z/

Note \\n \\r are both valid escape characters and \\r\\n together will match a dos line break if you don't want to include spaces/tabs.

Good reference: http://www.regular-expressions.info/reference.html

Answer 2

It's not the same error; rather, it's not erroring for the same reason you think it is.
It's not the newlines that are tripping your regex up, it's the numbers. ;-)
Add \\d to your regex as well: /\\A[\\w\\d\\s.,]+\\z/