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Q:

Trouble matching Name Servers in PHP with regular expressions

Hi everyone,

I'm having trouble matching Name Servers using regular expressions in PHP. I would greatly appreciate it if someone could help me out with this issue.

To give you a bit of background, I am currently working on a project where I need to validate and extract Name Servers from a given domain name. I have already tried using various regular expressions that I found online, but none of them seem to work properly.

Just to be clear, a typical Name Server looks like this: ns1.example.com or ns2.example.com. I am trying to extract the "ns1" or "ns2" part from the Name Server.

Here is the code I have so far:

```php
$domain = "ns1.example.com";
$pattern = "/^(ns\d+)/";
preg_match($pattern, $domain, $matches);

echo $matches[0];
```

However, when I run this code, it doesn't return anything. It seems like my regular expression is not matching the Name Server correctly.

I have tested my regular expression on online regex testers and it seems to work fine there. But when I try to implement it in my PHP code, it fails to match. I have also tried using different variations of the regular expression, but no luck so far.

I was wondering if anyone has faced a similar issue before or if there is something wrong with my code. Perhaps there is a better regular expression that I can use for matching Name Servers in PHP? Any suggestions or insights would be greatly appreciated.

Thank you in advance for your help!

All Replies

fbalistreri

User1: Hey there!

I had a similar issue a while back when I was working on a similar project. After some trial and error, I found a regular expression that worked well for matching Name Servers in PHP. Here's what worked for me:

php
$domain = "ns1.example.com";
$pattern = "/^([a-z0-9]+)\./i";
preg_match($pattern, $domain, $matches);

echo $matches[1];


In this case, the regular expression `/^([a-z0-9]+)\./i` matches any combination of lowercase letters and digits before the dot in the domain. It captures the desired part and stores it in `$matches[1]`.

Make sure to use the `i` flag after the pattern to ensure a case-insensitive match. Also, don't forget to escape any special characters if you are using them in your Name Server patterns.

Give it a try and see if it works for you. Let me know if you have any further questions!

gladyce48

User2: Howdy, folks!

I can totally understand the frustration you're experiencing with matching Name Servers in PHP using regular expressions. I recently encountered a similar challenge and came up with a different approach that might help you out.

Instead of relying solely on regular expressions, I used the built-in `parse_url()` function in PHP to extract the hostname from the domain. Then, I used the `explode()` function to split the hostname by the dot and retrieve the desired part of the Name Server. Here's an example:

php
$domain = "ns1.example.com";
$hostname = parse_url($domain, PHP_URL_HOST);
$nameServer = explode(".", $hostname)[0];

echo $nameServer;


In this code snippet, `parse_url()` extracts the hostname from the given domain, and `explode()` splits the hostname on the dot. The `[0]` index retrieves the first part of the resulting array, which represents the Name Server.

Give this method a shot and see if it works better for your use case. Sometimes using a combination of built-in functions can provide a more reliable solution. Let me know if you have any further questions or need additional assistance!

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