diff --git a/.travis.yml b/.travis.yml
index efd3c8f..e7735f2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,12 +9,12 @@ php:
 before_script:
     - composer self-update
     - composer install --prefer-source --no-interaction --dev
+    - wget https://scrutinizer-ci.com/ocular.phar
 
 script:
     - vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
 
 after_script:
-    - wget https://scrutinizer-ci.com/ocular.phar
     - php ocular.phar code-coverage:upload --format=php-clover coverage.clover
 
 matrix:
diff --git a/src/Bban/SpainBban.php b/src/Bban/SpainBban.php
index 76c8998..6060bd7 100644
--- a/src/Bban/SpainBban.php
+++ b/src/Bban/SpainBban.php
@@ -42,11 +42,11 @@ public function __construct(
         $checkDigits,
         $accountNumber
     ) {
-        static::validateBankCodeFormat($bankCode);
-        static::validateBranchCodeFormat($branchCode);
-        static::validateCheckDigitsFormat($checkDigits);
-        static::validateAccountNumberFormat($accountNumber);
-        static::validateControlDigit(
+        self::validateBankCodeFormat($bankCode);
+        self::validateBranchCodeFormat($branchCode);
+        self::validateCheckDigitsFormat($checkDigits);
+        self::validateAccountNumberFormat($accountNumber);
+        self::validateControlDigit(
             $bankCode,
             $branchCode,
             $checkDigits,
@@ -68,6 +68,8 @@ public function __construct(
      */
     public static function fromString($bban)
     {
+        $bban = preg_replace('/[^0-9a-zA-Z]+/', '', $bban);
+
         if (! preg_match('/^[\d]{20}$/', $bban)) {
             throw new InvalidArgumentException('Bban should be 20 numbers');
         }
diff --git a/src/Iban.php b/src/Iban.php
index 7506fd9..b068caf 100644
--- a/src/Iban.php
+++ b/src/Iban.php
@@ -42,9 +42,9 @@ class Iban
     public function __construct($countryCode, $checkDigits, BbanInterface $bban)
     {
         $countryCode = strtoupper($countryCode);
-        static::validateCountryCodeFormat($countryCode);
-        static::validateCheckDigitsFormat($checkDigits);
-        static::validateControlDigit($countryCode, $checkDigits, $bban);
+        self::validateCountryCodeFormat($countryCode);
+        self::validateCheckDigitsFormat($checkDigits);
+        self::validateControlDigit($countryCode, $checkDigits, $bban);
         $this->countryCode = $countryCode;
         $this->checkDigits = $checkDigits;
         $this->bban = $bban;
@@ -59,13 +59,15 @@ public function __construct($countryCode, $checkDigits, BbanInterface $bban)
      */
     public static function fromString($iban)
     {
-        if (! preg_match('/^[0-9A-Z]{16,34}$/', $iban)) {
+        $iban = preg_replace('/[^0-9a-zA-Z]+/', '', $iban);
+
+        if (! preg_match('/^[0-9a-zA-Z]{16,34}$/', $iban)) {
             throw new InvalidArgumentException('Iban should be between 16 and 34 characters');
         }
 
-        $countryCode = substr($iban, 0, 2);
-        $checkDigits = substr($iban, 2, 2);
-        $bbanString = substr($iban, 4);
+        $countryCode = strtoupper(substr($iban, 0, 2));
+        $checkDigits = strtoupper(substr($iban, 2, 2));
+        $bbanString = strtoupper(substr($iban, 4));
 
         self::validateSupportedCountry($countryCode);
         $bbanClass = self::$countriesSupported[$countryCode];
@@ -88,9 +90,9 @@ public static function fromString($iban)
      */
     public static function fromBbanAndCountry(BbanInterface $bban, $countryCode)
     {
-        static::validateCountryCodeFormat($countryCode);
-        static::validateCountryCodeFormat($countryCode);
-        static::validateSupportedCountry($countryCode);
+        self::validateCountryCodeFormat($countryCode);
+        self::validateCountryCodeFormat($countryCode);
+        self::validateSupportedCountry($countryCode);
 
         $checksum = self::validateChecksum($countryCode, '00', $bban);
         $checkDigit = 98 - (int) $checksum;
diff --git a/tests/IbanTest.php b/tests/IbanTest.php
index 29cee78..09f69f6 100644
--- a/tests/IbanTest.php
+++ b/tests/IbanTest.php
@@ -37,7 +37,7 @@ public function testValidIban(
 
         $iban = new Iban($countryCode, $ibanChecksum, $bban);
 
-        $this->assertEquals($countryCode, $iban->countryCode());
+        $this->assertEquals(strtoupper($countryCode), $iban->countryCode());
         $this->assertEquals($ibanChecksum, $iban->ibanCheckDigits());
         $this->assertEquals($bankCode, $iban->bankCode());
         $this->assertEquals($branchCode, $iban->branchCode());
@@ -68,7 +68,7 @@ public function testCreateFromValidString(
     ) {
         $stringIban = $countryCode . $ibanChecksum . $bankCode . $branchCode . $controlDigits . $bankAccount;
         $iban = Iban::fromString($stringIban);
-        $this->assertEquals($stringIban, $iban->__toString());
+        $this->assertEquals(strtoupper($stringIban), $iban->__toString());
     }
 
     /**
@@ -257,7 +257,7 @@ public function invalidChecksum()
     public function validIbans()
     {
         return [
-            ['ES', '68', '3841', '2436', '11', '6183191503'],
+            ['es', '68', '3841', '2436', '11', '6183191503'],
             ['ES', '78', '0989', '5990', '44', '6462241825'],
         ];
     }