Add between with unit tests

src/Stringizer.php

@@ -57,6 +57,7 @@
 use Stringizer\Transformers\CollapseWhitespace;
 use Stringizer\Transformers\Base64Check;
 use Stringizer\Transformers\Base64;
+use Stringizer\Transformers\Between;
 
 /**
  * Stringizer
@@ -160,6 +161,12 @@ public function concat($value, $preAppend = false)
         return $this;
     }
 
+    public function between($left,$right)
+    {
+        $this->value = (new Between($this->value,$left,$right))->execute();
+        return $this;
+    }
+
     public function contains($needle)
     {
         return (new Contains($this->value, $needle))->execute();

src/Transformers/Between.php

@@ -0,0 +1,40 @@
+<?php
+namespace Stringizer\Transformers;
+
+use Stringizer\Stringizer;
+
+/**
+ * Between - Extracts a string between left and right strings.
+ *
+ * @link https://github.com/jasonlam604/Stringizer
+ * @copyright Copyright (c) 2016 Jason Lam
+ * @license https://github.com/jasonlam604/Stringizer/blob/master/LICENSE (MIT License)
+ */
+class Between extends Transformer implements TransformerInterface
+{
+
+    private $left;
+    private $right;
+
+    public function __construct($value, $left, $right)
+    {
+        parent::__construct($value);
+        $this->left = $left;
+        $this->right = $right;
+    }
+
+    public function execute()
+    {
+        $str = $this->getValue();
+
+        if (mb_substr($this->getValue(), 0, mb_strlen($this->left)) == $this->left) {
+            $str = mb_substr($this->getValue(), mb_strlen($this->left));
+        }
+
+        if(mb_substr($this->getValue(), mb_strlen($this->getValue()) - mb_strlen($this->right), mb_strlen($this->right)) == $this->right) {
+            $str = mb_substr($str, 0, mb_strlen($str) - mb_strlen($this->right));
+        }
+
+        return $str;
+    }
+}

tests/BetweenTest.php

@@ -0,0 +1,31 @@
+<?php
+use Stringizer\Stringizer;
+
+/**
+ * Between Unit Tests
+ */
+class BetweenTest extends PHPUnit_Framework_TestCase
+{
+    public function testValid()
+    {
+        $s = new Stringizer("<div>Hello World</div>");
+        $this->assertEquals("Hello World", $s->between("<div>", "</div>"));
+
+        // Right Side no match, retains the last right side </div>
+        $s = new Stringizer("<div>Hello World</div></div>");
+        $this->assertEquals("Hello World</div>", $s->between("<div>", "</div>"));
+
+        $s = new Stringizer("<div>Hello World");
+        $this->assertEquals("Hello World", $s->between("<div>", "</div>"));
+    }
+
+    public function testValidMultiByte()
+    {
+        $s = new Stringizer("<div>ȘŦŗÍñĝìzĕŕ</div>");
+        $this->assertEquals("ȘŦŗÍñĝìzĕŕ", $s->between("<div>", "</div>"));
+
+        $s = new Stringizer("<div>こんにちは</div>");
+        $this->assertEquals("こんにちは", $s->between("<div>", "</div>"));
+    }
+
+}