bug symfony#28540 [Intl] parse numbers terminated with decimal separator (xabbuh)

This PR was merged into the 2.8 branch.

Discussion
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[Intl] parse numbers terminated with decimal separator

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#28500
| License       | MIT
| Doc PR        |

Commits
-------

4225f36 parse numbers terminated with decimal separator

Author: nicolas-grekas

src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php

@@ -516,7 +516,7 @@ public function parse($value, $type = self::TYPE_DOUBLE, &$position = 0)
         $groupSep = $this->getAttribute(self::GROUPING_USED) ? ',' : '';
 
         // Any string before the numeric value causes error in the parsing
-        if (preg_match("/^-?(?:\.\d++|([\d{$groupSep}]++)(?:\.\d++)?)/", $value, $matches)) {
+        if (preg_match("/^-?(?:\.\d++|([\d{$groupSep}]++)(?:\.\d*+)?)/", $value, $matches)) {
             $value = $matches[0];
             $position = \strlen($value);
             if ($error = $groupSep && isset($matches[1]) && !preg_match('/^\d{1,3}+(?:(?:,\d{3})++|\d*+)$/', $matches[1])) {

src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php

@@ -654,6 +654,7 @@ public function parseProvider()
             array('-123,4567', false, '->parse() does not parse when invalid grouping used.', 9),
             array('-123,,456', false, '->parse() does not parse when invalid grouping used.', 4),
             array('-123,,456', -123.0, '->parse() parses when grouping is disabled.', 4, false),
+            array('239.', 239.0, '->parse() parses when string ends with decimal separator.', 4, false),
         );
     }