Allow any character to be escaped in the path for links.

org_mode_samples/object/regular_link/elisp.org

@@ -0,0 +1 @@
+[[elisp:(local-set-key "\M-\x" 'foo-bar-baz)]]

src/compare/diff.rs

@@ -1926,6 +1926,8 @@ fn compare_regular_link<'s>(
         Ok(_) => {}
     };
 
+    // TODO: Compare :type :path :format :raw-link :application :search-option
+
     Ok(DiffResult {
         status: this_status,
         name: emacs_name.to_owned(),

src/parser/regular_link.rs

@@ -2,7 +2,7 @@ use nom::branch::alt;
 use nom::bytes::complete::escaped;
 use nom::bytes::complete::tag;
 use nom::bytes::complete::take_till1;
-use nom::character::complete::one_of;
+use nom::character::complete::anychar;
 use nom::combinator::verify;
 use nom::multi::many_till;
 
@@ -82,7 +82,7 @@ fn pathreg<'b, 'g, 'r, 's>(
             _ => false,
         }),
         '\\',
-        one_of(r#"]"#),
+        anychar,
     )(input)?;
     Ok((remaining, path))
 }