diff --git a/regex_macros/tests/tests.rs b/regex_macros/tests/tests.rs
index ecd965ff8f..81f3c497c7 100644
--- a/regex_macros/tests/tests.rs
+++ b/regex_macros/tests/tests.rs
@@ -189,6 +189,8 @@ replace!(rep_all, replace_all, r"\d", "age: 26", "Z", "age: ZZ");
 replace!(rep_groups, replace, r"(\S+)\s+(\S+)", "w1 w2", "$2 $1", "w2 w1");
 replace!(rep_double_dollar, replace,
          r"(\S+)\s+(\S+)", "w1 w2", "$2 $$1", "w2 $1");
+replace!(rep_adjacent_index, replace,
+         r"([^aeiouy])ies$", "skies", "$1y", "sky");
 replace!(rep_no_expand, replace,
          r"(\S+)\s+(\S+)", "w1 w2", NoExpand("$2 $1"), "$2 $1");
 replace!(rep_named, replace_all,
diff --git a/src/re.rs b/src/re.rs
index 845f53a010..c4ecd669ba 100644
--- a/src/re.rs
+++ b/src/re.rs
@@ -780,7 +780,7 @@ impl<'t> Captures<'t> {
     pub fn expand(&self, text: &str) -> String {
         // How evil can you get?
         // FIXME: Don't use regexes for this. It's completely unnecessary.
-        let re = Regex::new(r"(^|[^$]|\b)\$(\w+)").unwrap();
+        let re = Regex::new(r"(^|[^$]|\b)\$(\d+|\w+)").unwrap();
         let text = re.replace_all(text, |refs: &Captures| -> String {
             let pre = refs.at(1).unwrap_or("");
             let name = refs.at(2).unwrap_or("");