diff --git a/src/elan/toolchain.rs b/src/elan/toolchain.rs
index 6fc77d0..85ce95f 100644
--- a/src/elan/toolchain.rs
+++ b/src/elan/toolchain.rs
@@ -41,7 +41,7 @@ pub struct ComponentStatus {
 pub struct UnresolvedToolchainDesc(pub ToolchainDesc);
 
 pub fn lookup_unresolved_toolchain_desc(cfg: &Cfg, name: &str) -> Result<UnresolvedToolchainDesc> {
-    let pattern = r"^(?:([a-zA-Z0-9-_]+[/][a-zA-Z0-9-_]+)[:])?([a-zA-Z0-9-.]+)$";
+    let pattern = r"^(?:((?:[a-zA-Z0-9-_]+[/])*[a-zA-Z0-9-_]+)[:])?([a-zA-Z0-9-.]+)$";
 
     let re = Regex::new(pattern).unwrap();
     if let Some(c) = re.captures(name) {