fix the marker regex

Summary: This switches regex to multiline fixing the problem with us not recognising the marker.

Reviewed By: RajivTS, singhsrb

Differential Revision: D64341265

fbshipit-source-id: d8b0bf51e4bbabedf127ac196cb46164fda15d9a

eden/mononoke/hooks/src/implementations/block_accidental_new_bookmark_creation.rs

@@ -71,7 +71,7 @@ impl BlockAccidentalNewBookmarkCreationHook {
         }) = config.allow_creations_with_marker
         {
             let marker_extraction_regex = Regex::new(&format!(
-                r"^{}:\s*(?<{}>.+?)(\s|$|\n)",
+                r"(?m)^{}:\s*(?<{}>.+?)(\s|$|\n)",
                 &marker, &NAMED_CAPTURE_NAME
             ))?;
             Some(CreationAllowedWithMarkerOptions {

eden/mononoke/tests/integration/mononoke_git_server/test-mononoke-git-server-block-accidental-new-bookmark-creation.t

@@ -112,12 +112,7 @@
 
   $ git_client push origin brand_new_branch2
   To https://localhost:$LOCAL_PORT/repos/git/ro/repo.git
-   ! [remote rejected] brand_new_branch2 -> brand_new_branch2 (hooks failed:
-    block_accidental_new_bookmark_creation for 8c3df9fb1ac00e7b3f93ca1d4e6557cb34e54da9: Add "@new-branch: brand_new_branch2" to the commit message to be able to create this branch.
-
-  For more information about hooks and bypassing, refer https://fburl.com/wiki/mb4wtk1j)
-  error: failed to push some refs to 'https://localhost:$LOCAL_PORT/repos/git/ro/repo.git'
-  [1]
+   * [new branch]      brand_new_branch2 -> brand_new_branch2
   $ quiet git checkout HEAD^
 
 # now test the bypass based on bookmark matching a regex