Add emailDomain helper

Author: mpstenson

README.md

@@ -25,11 +25,12 @@ AdvStr::redactSsn('My social security number is 222-22-2222'); // My social secu
 - [Usage](#usage)
 - [Available Methods](#available-methods)
   - [advPassword](#advpassword)
-  - [readTime](#readtime)
   - [charWrap](#charwrap)
-  - [splitName](#splitname)
-  - [redactSsn](#redactssn)
+  - [emailDomain](#emaildomain)
+  - [readTime](#readtime)
   - [redactCreditCard](#redactcreditcard)
+  - [redactSsn](#redactssn)
+  - [splitName](#splitname)
 - [Testing](#testing)
 - [Changelog](#changelog)
 - [Contributing](#contributing)
@@ -104,58 +105,77 @@ public static function advPassword(
 #### Returns:
 - string: Generated password
 
-### [readTime](#readtime)
+### [charWrap](#charwrap)
 
-Calculates the read time of a string.
+Wraps a string at a given number of characters regardless of words.
 
 ```php
-public static function readTime(
+public static function charWrap(
     $string, 
-    $wpm = 200
+    $length = 80
 )
 ```
 
 #### Parameters:
-- `$string` (string): The text to calculate read time for
-- `$wpm` (int): Words per minute (default: 200)
+- `$string` (string): The string to wrap
+- `$length` (int): The number of characters to wrap at (default: 80)
 
 #### Returns:
-- int: Estimated read time in seconds
+- string: The wrapped string
 
-### [charWrap](#charwrap)
+### [emailDomain](#emailDomain)
 
 Wraps a string at a given number of characters regardless of words.
 
 ```php
-public static function charWrap(
-    $string, 
-    $length = 80
+public static function EmailDomain(
+    $string
 )
 ```
 
 #### Parameters:
-- `$string` (string): The string to wrap
-- `$length` (int): The number of characters to wrap at (default: 80)
+- `$string` (string): The string to extract the email domain from.
 
 #### Returns:
-- string: The wrapped string
+- string: The email domain from the string
 
-### [splitName](#splitname)
+### [readTime](#readtime)
 
-Splits a full name into first name, middle name (if present), and last name, removing any prefixes and suffixes. This method can handle both "Firstname Lastname" and "Lastname, Firstname" formats.
+Calculates the read time of a string.
 
 ```php
-public static function splitName(
-    $name
+public static function readTime(
+    $string, 
+    $wpm = 200
 )
 ```
 
 #### Parameters:
-- `$name` (string): The full name to split
+- `$string` (string): The text to calculate read time for
+- `$wpm` (int): Words per minute (default: 200)
 
 #### Returns:
-- array: An associative array containing 'first', 'middle' (if present), and 'last' name
+- int: Estimated read time in seconds
+
+### [redactCreditCard](#redactcreditcard)
+Note: This method is currently not implemented (TODO).
+Redacts credit card numbers in a string.
+
+```php
+public static function redactCreditCard(
+    $string, 
+    $redacted = '********', 
+    $exclude = []
+)
+```
+
+#### Parameters:
+- `$string` (string): The string containing credit card numbers to redact
+- `$redacted` (string): The string to replace credit card numbers with (default: '********')
+- `$exclude` (array): An array of credit card types to exclude from redaction
 
+#### Returns:
+- string: The string with credit card numbers redacted
 ### [redactSsn](#redactssn)
 
 Redacts Social Security Numbers (SSN) in a string.
@@ -178,27 +198,21 @@ public static function redactSsn(
 #### Returns:
 - string: The string with SSNs redacted
 
-### [redactCreditCard](#redactcreditcard)
+### [splitName](#splitname)
 
-Redacts credit card numbers in a string.
+Splits a full name into first name, middle name (if present), and last name, removing any prefixes and suffixes. This method can handle both "Firstname Lastname" and "Lastname, Firstname" formats.
 
 ```php
-public static function redactCreditCard(
-    $string, 
-    $redacted = '********', 
-    $exclude = []
+public static function splitName(
+    $name
 )
 ```
 
 #### Parameters:
-- `$string` (string): The string containing credit card numbers to redact
-- `$redacted` (string): The string to replace credit card numbers with (default: '********')
-- `$exclude` (array): An array of credit card types to exclude from redaction
+- `$name` (string): The full name to split
 
 #### Returns:
-- string: The string with credit card numbers redacted
-
-Note: This method is currently not implemented (TODO).
+- array: An associative array containing 'first', 'middle' (if present), and 'last' name
 
 
 ## Testing

src/AdvStr.php

@@ -259,6 +259,22 @@ public static function redactSsn($string, $redacted = '********', $dashes = true
         return $string;
     }
 
+    /**
+     * Extracts the domain from an email address.
+     *
+     * @param  string  $string  The email address to extract the domain from.
+     * @return string The domain extracted from the email address.
+     */
+    public static function emailDomain($string)
+    {
+        // Extract the domain using regex
+        if (preg_match('/@([a-zA-Z0-9.-]+)/', $string, $matches)) {
+            return $matches[1];
+        }
+
+        return '';
+    }
+
     /**
      * Redacts credit card numbers and replaces them with a given string
      *

tests/EmailDomainTest.php

@@ -0,0 +1,23 @@
+<?php
+
+use mpstenson\AdvStr\Facades\AdvStr;
+
+test('Can get email domain', function () {
+    $domain = AdvStr::emailDomain('[email protected]');
+    expect($domain)->toBe('example.com');
+});
+
+test('Can get email domain with subdomain', function () {
+    $domain = AdvStr::emailDomain('[email protected]');
+    expect($domain)->toBe('test.example.com');
+});
+
+test('Can get email domain with trailing spaces and text', function () {
+    $domain = AdvStr::emailDomain('[email protected]  some more text');
+    expect($domain)->toBe('example.com');
+});
+
+test('Cat get email domain with not allowed characters afterwards', function () {
+    $domain = AdvStr::emailDomain('"example user" <[email protected]>');
+    expect($domain)->toBe('example.com');
+});