Allow and ignore semver build metadata, fixes #2422

src/Composer/Package/Version/VersionParser.php

@@ -103,6 +103,11 @@ class VersionParser
             $version = $match[1];
         }
 
+        // ignore build metadata
+        if (preg_match('{^([^,\s+]+)\+[^\s]+$}', $version, $match)) {
+            $version = $match[1];
+        }
+
         // match master-like branches
         if (preg_match('{^(?:dev-)?(?:master|trunk|default)$}i', $version)) {
             return '9999999-dev';

tests/Composer/Test/Package/Version/VersionParserTest.php

@@ -110,6 +110,10 @@ class VersionParserTest extends \PHPUnit_Framework_TestCase
             'parses arbitrary2'  => array('DEV-FOOBAR',          'dev-FOOBAR'),
             'parses arbitrary3'  => array('dev-feature/foo',     'dev-feature/foo'),
             'ignores aliases'    => array('dev-master as 1.0.0', '9999999-dev'),
+            'semver metadata'    => array('dev-master+foo.bar',  '9999999-dev'),
+            'semver metadata/2'  => array('1.0.0-beta.5+foo',    '1.0.0.0-beta5'),
+            'semver metadata/3'  => array('1.0.0+foo',           '1.0.0.0'),
+            'metadata w/ alias'  => array('1.0.0+foo as 2.0',    '1.0.0.0'),
         );
     }
 
@@ -131,6 +135,7 @@ class VersionParserTest extends \PHPUnit_Framework_TestCase
             'invalid type'      => array('1.0.0-meh'),
             'too many bits'     => array('1.0.0.0.0'),
             'non-dev arbitrary' => array('feature-foo'),
+            'metadata w/ space' => array('1.0.0+foo bar'),
         );
     }