isHex.

src/Utils.php

@@ -118,7 +118,7 @@ class Utils
         if (!is_string($value)) {
             throw new InvalidArgumentException('The value to zeroPrefixed function must be string.');
         }
-        return (strpos($value, '0x') === 0);
+        return (strpos($value, '0x') === 0) ;
     }
 
     /**
@@ -178,6 +178,17 @@ class Utils
         return true;
     }
 
+    /**
+     * isHex
+     * 
+     * @param string
+     * @return bool
+     */
+    public static function isHex($value)
+    {
+        return (is_string($value) && preg_match('/^(0x)?[a-f0-9]*$/', $value) === 1);
+    }
+
     /**
      * sha3
      * keccak256

test/unit/UtilsTest.php

@@ -366,4 +366,24 @@ class UtilsTest extends TestCase
 
         $this->assertEquals($jsonArrayDepth2, $jsonAssoc);
     }
+
+    /**
+     * testIsHex
+     * 
+     * @return void
+     */
+    public function testIsHex()
+    {
+        $isHex = Utils::isHex($this->testHex);
+
+        $this->assertTrue($isHex);
+
+        $isHex = Utils::isHex('0x' . $this->testHex);
+
+        $this->assertTrue($isHex);
+
+        $isHex = Utils::isHex('hello world');
+
+        $this->assertFalse($isHex);
+    }
 }