diff --git a/packages/mermaid/src/diagram-api/regexes.ts b/packages/mermaid/src/diagram-api/regexes.ts
index fafca1957..66873be31 100644
--- a/packages/mermaid/src/diagram-api/regexes.ts
+++ b/packages/mermaid/src/diagram-api/regexes.ts
@@ -3,8 +3,7 @@
 // Note that JS doesn't support the "\A" anchor, which means we can't use
 // multiline mode.
 // Relevant YAML spec: https://yaml.org/spec/1.2.2/#914-explicit-documents
-export const frontMatterRegex =
-  /^\uFEFF?[\t ]*-{3}[\t ]*\r?\n([\S\s]*?)\r?\n[\t ]*-{3}[\t ]*(?:\r?\n|$)/;
+export const frontMatterRegex = /^\uFEFF?[\t ]*-{3}[\t ]*\r?\n([\S\s]*?)\r?\n-{3}[\t ]*(?:\r?\n|$)/;
 
 export const directiveRegex =
   /%{2}{\s*(?:(\w+)\s*:|(\w+))\s*(?:(\w+)|((?:(?!}%{2}).|\r?\n)*))?\s*(?:}%{2})?/gi;