From 1d47285b8b4c1c1b220250301816b572a2586411 Mon Sep 17 00:00:00 2001
From: srdante <minidantebtc@gmail.com>
Date: Sat, 26 Feb 2022 03:15:44 -0300
Subject: [PATCH] Fix preg match & testings

---
 src/Utils.php                               | 2 +-
 test/unit/OptionalQuantityFormatterTest.php | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Utils.php b/src/Utils.php
index be80c9d..8883c2b 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -529,7 +529,7 @@ class Utils
                 $number = str_replace('-', '', $number, $count);
                 $negative1 = new BigNumber(-1);
             }
-            if (self::isZeroPrefixed($number) || preg_match('/[a-f]+/', $number) === 1) {
+            if (self::isZeroPrefixed($number) || preg_match('/^[0-9a-f]+$/i', $number) === 1) {
                 $number = self::stripZero($number);
                 $bn = new BigNumber($number, 16);
             } elseif (empty($number)) {
diff --git a/test/unit/OptionalQuantityFormatterTest.php b/test/unit/OptionalQuantityFormatterTest.php
index 0f0f9ec..6ee009f 100644
--- a/test/unit/OptionalQuantityFormatterTest.php
+++ b/test/unit/OptionalQuantityFormatterTest.php
@@ -55,6 +55,8 @@ class OptionalQuantityFormatterTest extends TestCase
         $this->assertEquals('latest', $formatter->format('latest'));
         $this->assertEquals('earliest', $formatter->format('earliest'));
         $this->assertEquals('pending', $formatter->format('pending'));
-        $this->assertEquals('0x0', $formatter->format('hello'));
+
+        $this->expectExceptionMessage('toBn number must be valid hex string.');
+        $formatter->format('hello');
     }
 }
\ No newline at end of file