bug #816 [YSM] fix array key regex (jrushlow)

This PR was merged into the 1.0-dev branch.

Discussion
----------

[YSM] fix array key regex

This fixes an issue if an existing array has a `:` within the value, `YamlSourceManipulator` could mistake part of the value for the array key when determining position.

E.g.
```yaml
config:
    - '80:80'
```

YSM would pick the `0:` within `80:80` as the array key.

Commits
-------

fc359f1 fix array key regex

Author: weaverryan

src/Util/YamlSourceManipulator.php

@@ -684,7 +684,7 @@ private function getEndOfPreviousKeyPosition($key): int
 
     private function getKeyRegex($key)
     {
-        return sprintf('#%s( )*:#', preg_quote($key));
+        return sprintf('#\b%s( )*:#', preg_quote($key));
     }
 
     private function updateContents(string $newContents, array $newData, int $newPosition)

tests/Util/yaml_fixtures/array_semicolon_separator.test

@@ -0,0 +1,10 @@
+caddy:
+    ports:
+      - '80:80'
+===
+$data['caddy']['ports'][] = '443:443';
+===
+caddy:
+    ports:
+      - '80:80'
+      - '443:443'