MINIFI-497 ะก2 Server: Fix wrong regex pattern in "getConfiguration" (NiFiRestConfigurationProvider.java)

This closes #151.

Signed-off-by: Aldrin Piri <aldrin@apache.org>
diff --git a/minifi-c2/minifi-c2-provider/minifi-c2-provider-nifi-rest/src/main/java/org/apache/nifi/minifi/c2/provider/nifi/rest/NiFiRestConfigurationProvider.java b/minifi-c2/minifi-c2-provider/minifi-c2-provider-nifi-rest/src/main/java/org/apache/nifi/minifi/c2/provider/nifi/rest/NiFiRestConfigurationProvider.java
index 8f0bf2c..6067d7c 100644
--- a/minifi-c2/minifi-c2-provider/minifi-c2-provider-nifi-rest/src/main/java/org/apache/nifi/minifi/c2/provider/nifi/rest/NiFiRestConfigurationProvider.java
+++ b/minifi-c2/minifi-c2-provider/minifi-c2-provider-nifi-rest/src/main/java/org/apache/nifi/minifi/c2/provider/nifi/rest/NiFiRestConfigurationProvider.java
@@ -102,7 +102,7 @@
 
         String id = null;
         if (version == null) {
-            String filenamePattern = Arrays.stream(filename.split(Pattern.quote("${version}"), -1)).map(Pattern::quote).collect(Collectors.joining("([0-9+])"));
+            String filenamePattern = Arrays.stream(filename.split(Pattern.quote("${version}"), -1)).map(Pattern::quote).collect(Collectors.joining("([0-9]+)"));
             Pair<String, Integer> maxIdAndVersion = getMaxIdAndVersion(filenamePattern);
             id = maxIdAndVersion.getFirst();
             version = maxIdAndVersion.getSecond();