diff --git a/systeroid-parser/src/document.rs b/systeroid-parser/src/document.rs
index 271b158..b0d2ac1 100644
--- a/systeroid-parser/src/document.rs
+++ b/systeroid-parser/src/document.rs
@@ -76,7 +76,7 @@ mod tests {
     fn test_paragraph() -> Result<(), Error> {
         let input =
             reader::read_to_string(PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("Cargo.toml"))?;
-        let captures = RegexBuilder::new(r#"^\[[a-zA-Z]+\]\n"#)
+        let captures = RegexBuilder::new(r#"^(\[[a-zA-Z]+\])\n"#)
             .multi_line(true)
             .build()?
             .captures_iter(&input)
diff --git a/systeroid-parser/src/parser.rs b/systeroid-parser/src/parser.rs
index 2f513e8..e1ab1bb 100644
--- a/systeroid-parser/src/parser.rs
+++ b/systeroid-parser/src/parser.rs
@@ -59,7 +59,7 @@ mod tests {
     #[test]
     fn test_document_parser() -> Result<(), Error> {
         let base_path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
-        let parser = Parser::new("Cargo.*", r#"^\[package\]\n"#)?;
+        let parser = Parser::new("Cargo.*", r#"^(\[package\])\n"#)?;
         let mut documents = parser.parse(base_path.as_path())?;
 
         assert!(documents[0].paragraphs[0]
diff --git a/systeroid-parser/tests/integration_test.rs b/systeroid-parser/tests/integration_test.rs
index 87d403d..9e42f45 100644
--- a/systeroid-parser/tests/integration_test.rs
+++ b/systeroid-parser/tests/integration_test.rs
@@ -5,7 +5,7 @@ use systeroid_parser::parser::Parser;
 #[test]
 fn test_parser() -> Result<(), Error> {
     let base_path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
-    let parser = Parser::new("src/*.rs", r#"^#\[cfg\(test\)\]$\n"#)?;
+    let parser = Parser::new("src/*.rs", r#"^(#\[cfg\(test\)\])$\n"#)?;
     let documents = parser.parse(base_path.as_path())?;
 
     assert!(documents