push: Panic on Regex construction error

crates/ruma-common/src/push/condition.rs

@@ -392,7 +392,8 @@ impl StrExt for str {
             // The word characters in ASCII compatible mode (with the `-u` flag) match the
             // definition in the spec: any character not in the set `[A-Za-z0-9_]`.
             let regex = format!(r"(?-u:^|\W|\b){}(?-u:\b|\W|$)", chunks.concat());
-            Regex::new(&regex).ok().filter(|re| re.is_match(self.as_bytes())).is_some()
+            let re = Regex::new(&regex).expect("regex construction should succeed");
+            re.is_match(self.as_bytes())
         } else {
             match self.find(pattern) {
                 Some(start) => {