fix: adjusted host regex (demeter-run#70)

Author: paulobressan

proxy/src/main.rs

@@ -52,7 +52,7 @@ impl State {
     pub fn try_new() -> Result<Self, Box<dyn Error>> {
         let config = Config::new();
         let metrics = Metrics::try_new(Registry::default())?;
-        let host_regex = Regex::new(r"(dmtr_[\w\d-]+)?\.?.+")?;
+        let host_regex = Regex::new(r"([dmtr_]?[\w\d-]+)?\.?.+")?;
         let consumers = Default::default();
         let tiers = Default::default();
         let limiter = Default::default();