Re: regex usage
| From: | Richard Lynch | Date: | Mon, 18 Feb 2008 16:57:56 +0000 |
| Subject: | Re: regex usage | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-269493@lists.php.net to get a copy of this message | ||
On Sun, February 17, 2008 9:34 am, Valedol wrote:
> Is there a mothod to check string`s length with regex or the only way
> is
> using strlen?
>
> I want string consisting of 4 digits
> and check string with this code:
>
> if (preg_match("/\d{4}/",$_POST[id]))
> { echo $_POST[id]; }
>
> but preg_match returns true when string consists of 4 or more digits
Actually, it will return true for anthing with 4 consecutive digits
anywhere inside it, including:
abc1234def
You want:
"/^\d{4}\$/"
if you want EXACTLY 4 digits and nothing more.
^ anchors the string at the start
$ anchors the string at the end
The \ in front of $ is because $ is PHP for a variable, and while
there are not characters after it, so it's NOT a variable today, you
might add some on another day...
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