bug symfony#17526 Escape the delimiter in Glob::toRegex (javiereguiluz)

This PR was submitted for the 2.7 branch but it was merged into the 2.3 branch instead (closes symfony#17526).

Discussion
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Escape the delimiter in Glob::toRegex

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#13531
| License       | MIT
| Doc PR        | -

Commits
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2c45f46 Escape the delimiter in Glob::toRegex

Author: fabpot

src/Symfony/Component/Finder/Glob.php

@@ -65,7 +65,7 @@ public static function toRegex($glob, $strictLeadingDot = true, $strictWildcardS
                 $firstByte = true;
             }
 
-            if ('.' === $car || '(' === $car || ')' === $car || '|' === $car || '+' === $car || '^' === $car || '$' === $car) {
+            if ($delimiter === $car || '.' === $car || '(' === $car || ')' === $car || '|' === $car || '+' === $car || '^' === $car || '$' === $car) {
                 $regex .= "\\$car";
             } elseif ('*' === $car) {
                 $regex .= $escaping ? '\\*' : ($strictWildcardSlash ? '[^/]*' : '.*');