diff --git a/actix-router/Cargo.toml b/actix-router/Cargo.toml
index 216d4bff..b0bea9b6 100644
--- a/actix-router/Cargo.toml
+++ b/actix-router/Cargo.toml
@@ -20,11 +20,12 @@ path = "src/lib.rs"
 default = ["http"]
 
 [dependencies]
+bytestring = ">=0.1.5, <2"
+either = "1.6"
+http = { version = "0.2.3", optional = true }
+log = "0.4"
 regex = "1.5"
 serde = "1"
-bytestring = ">=0.1.5, <2"
-log = "0.4"
-http = { version = "0.2.3", optional = true }
 
 [dev-dependencies]
 http = "0.2.3"
diff --git a/actix-router/src/lib.rs b/actix-router/src/lib.rs
index 5850b103..72b03900 100644
--- a/actix-router/src/lib.rs
+++ b/actix-router/src/lib.rs
@@ -4,6 +4,8 @@
 #![doc(html_logo_url = "https://actix.rs/img/logo.png")]
 #![doc(html_favicon_url = "https://actix.rs/favicon.ico")]
 
+use either::Either;
+
 mod de;
 mod path;
 mod resource;
@@ -40,98 +42,64 @@ impl ResourcePath for bytestring::ByteString {
     }
 }
 
-/// Helper trait for type that could be converted to path pattern
-pub trait IntoPattern {
-    fn is_single(&self) -> bool;
-
-    fn patterns(&self) -> Vec<String>;
+/// Helper trait for type that could be converted to one or more path pattern.
+pub trait IntoPatterns {
+    fn patterns(&self) -> Either<String, Vec<String>>;
 }
 
-impl IntoPattern for String {
-    fn is_single(&self) -> bool {
-        true
-    }
-
-    fn patterns(&self) -> Vec<String> {
-        vec![self.clone()]
+impl IntoPatterns for String {
+    fn patterns(&self) -> Either<String, Vec<String>> {
+        Either::Left(self.clone())
     }
 }
 
-impl<'a> IntoPattern for &'a String {
-    fn is_single(&self) -> bool {
-        true
-    }
-
-    fn patterns(&self) -> Vec<String> {
-        vec![self.as_str().to_string()]
+impl<'a> IntoPatterns for &'a String {
+    fn patterns(&self) -> Either<String, Vec<String>> {
+        Either::Left((*self).clone())
     }
 }
 
-impl<'a> IntoPattern for &'a str {
-    fn is_single(&self) -> bool {
-        true
-    }
-
-    fn patterns(&self) -> Vec<String> {
-        vec![(*self).to_string()]
+impl<'a> IntoPatterns for &'a str {
+    fn patterns(&self) -> Either<String, Vec<String>> {
+        Either::Left((*self).to_owned())
     }
 }
 
-impl<T: AsRef<str>> IntoPattern for Vec<T> {
-    fn is_single(&self) -> bool {
-        self.len() == 1
-    }
+impl<T: AsRef<str>> IntoPatterns for Vec<T> {
+    fn patterns(&self) -> Either<String, Vec<String>> {
+        let mut patterns = self.iter().map(|v| v.as_ref().to_owned());
 
-    fn patterns(&self) -> Vec<String> {
-        self.iter().map(|v| v.as_ref().to_string()).collect()
-    }
-}
-
-macro_rules! array_patterns (($tp:ty, $num:tt) => {
-    impl IntoPattern for [$tp; $num] {
-        fn is_single(&self) -> bool {
-            $num == 1
+        match patterns.size_hint() {
+            (1, _) => Either::Left(patterns.next().unwrap()),
+            _ => Either::Right(patterns.collect()),
         }
+    }
+}
 
-        fn patterns(&self) -> Vec<String> {
-            self.iter().map(|v| v.to_string()).collect()
+macro_rules! array_patterns_single (($tp:ty) => {
+    impl IntoPatterns for [$tp; 1] {
+        fn patterns(&self) -> Either<String, Vec<String>> {
+            Either::Left(self[0].to_owned())
         }
     }
 });
 
-array_patterns!(&str, 1);
-array_patterns!(&str, 2);
-array_patterns!(&str, 3);
-array_patterns!(&str, 4);
-array_patterns!(&str, 5);
-array_patterns!(&str, 6);
-array_patterns!(&str, 7);
-array_patterns!(&str, 8);
-array_patterns!(&str, 9);
-array_patterns!(&str, 10);
-array_patterns!(&str, 11);
-array_patterns!(&str, 12);
-array_patterns!(&str, 13);
-array_patterns!(&str, 14);
-array_patterns!(&str, 15);
-array_patterns!(&str, 16);
+macro_rules! array_patterns_multiple (($tp:ty, $str_fn:expr, $($num:tt) +) => {
+    // for each array length specified in $num
+    $(
+        impl IntoPatterns for [$tp; $num] {
+            fn patterns(&self) -> Either<String, Vec<String>> {
+                Either::Right(self.iter().map($str_fn).collect())
+            }
+        }
+    )+
+});
 
-array_patterns!(String, 1);
-array_patterns!(String, 2);
-array_patterns!(String, 3);
-array_patterns!(String, 4);
-array_patterns!(String, 5);
-array_patterns!(String, 6);
-array_patterns!(String, 7);
-array_patterns!(String, 8);
-array_patterns!(String, 9);
-array_patterns!(String, 10);
-array_patterns!(String, 11);
-array_patterns!(String, 12);
-array_patterns!(String, 13);
-array_patterns!(String, 14);
-array_patterns!(String, 15);
-array_patterns!(String, 16);
+array_patterns_single!(&str);
+array_patterns_multiple!(&str, |&v| v.to_owned(), 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16);
+
+array_patterns_single!(String);
+array_patterns_multiple!(String, |v| v.clone(), 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16);
 
 #[cfg(feature = "http")]
 mod url;
@@ -140,10 +108,11 @@ mod url;
 pub use self::url::{Quoter, Url};
 
 #[cfg(feature = "http")]
-mod http_support {
-    use super::ResourcePath;
+mod http_impls {
     use http::Uri;
 
+    use super::ResourcePath;
+
     impl ResourcePath for Uri {
         fn path(&self) -> &str {
             self.path()
diff --git a/actix-router/src/resource.rs b/actix-router/src/resource.rs
index ad3d47e2..3d402c1b 100644
--- a/actix-router/src/resource.rs
+++ b/actix-router/src/resource.rs
@@ -6,10 +6,11 @@ use std::{
     mem,
 };
 
+use either::Either;
 use regex::{escape, Regex, RegexSet};
 
 use crate::path::{Path, PathItem};
-use crate::{IntoPattern, Resource, ResourcePath};
+use crate::{IntoPatterns, Resource, ResourcePath};
 
 const MAX_DYNAMIC_SEGMENTS: usize = 16;
 
@@ -25,9 +26,6 @@ const REGEX_FLAGS: &str = "(?s-m)";
 pub struct ResourceDef {
     id: u16,
 
-    /// Pattern type.
-    pat_type: PatternType,
-
     /// Optional name of resource definition. Defaults to "".
     name: String,
 
@@ -35,6 +33,9 @@ pub struct ResourceDef {
     // TODO: Sort of, in dynamic set pattern type it is blank, consider change to option.
     pattern: String,
 
+    /// Pattern type.
+    pat_type: PatternType,
+
     /// List of elements that compose the pattern, in order.
     ///
     /// `None` with pattern type is DynamicSet.
@@ -75,29 +76,45 @@ impl ResourceDef {
     /// Parse path pattern and create new `Pattern` instance.
     ///
     /// Panics if path pattern is malformed.
-    pub fn new<T: IntoPattern>(path: T) -> Self {
-        if path.is_single() {
-            ResourceDef::from_single_pattern(&path.patterns()[0], false)
-        } else {
-            let mut data = Vec::new();
-            let mut re_set = Vec::new();
+    pub fn new<T: IntoPatterns>(path: T) -> Self {
+        match path.patterns() {
+            Either::Left(pattern) => ResourceDef::from_single_pattern(&pattern, false),
 
-            for pattern in path.patterns() {
-                match ResourceDef::parse(&pattern, false, true) {
-                    (PatternType::Dynamic(re, names), _) => {
-                        re_set.push(re.as_str().to_owned());
-                        data.push((re, names));
-                    }
-                    _ => unreachable!(),
+            Either::Right(patterns) => {
+                if patterns.is_empty() {
+                    // since zero length pattern sets are possible, return a useless `ResourceDef`
+
+                    return ResourceDef {
+                        id: 0,
+                        name: String::new(),
+                        pattern: String::new(),
+                        pat_type: PatternType::DynamicSet(RegexSet::empty(), Vec::new()),
+                        elements: None,
+                    };
                 }
-            }
 
-            ResourceDef {
-                id: 0,
-                pat_type: PatternType::DynamicSet(RegexSet::new(re_set).unwrap(), data),
-                elements: None,
-                name: String::new(),
-                pattern: "".to_owned(),
+                let mut re_set = Vec::with_capacity(patterns.len());
+                let mut pattern_data = Vec::new();
+
+                for pattern in patterns {
+                    match ResourceDef::parse(&pattern, false, true) {
+                        (PatternType::Dynamic(re, names), _) => {
+                            re_set.push(re.as_str().to_owned());
+                            pattern_data.push((re, names));
+                        }
+                        _ => unreachable!(),
+                    }
+                }
+
+                let pattern_re_set = RegexSet::new(re_set).unwrap();
+
+                ResourceDef {
+                    id: 0,
+                    name: String::new(),
+                    pattern: String::new(),
+                    pat_type: PatternType::DynamicSet(pattern_re_set, pattern_data),
+                    elements: None,
+                }
             }
         }
     }
diff --git a/actix-router/src/router.rs b/actix-router/src/router.rs
index aeb1aa36..007ef495 100644
--- a/actix-router/src/router.rs
+++ b/actix-router/src/router.rs
@@ -1,4 +1,4 @@
-use crate::{IntoPattern, Resource, ResourceDef, ResourcePath};
+use crate::{IntoPatterns, Resource, ResourceDef, ResourcePath};
 
 #[derive(Debug, Copy, Clone, PartialEq)]
 pub struct ResourceId(pub u16);
@@ -88,7 +88,7 @@ pub struct RouterBuilder<T, U = ()> {
 
 impl<T, U> RouterBuilder<T, U> {
     /// Register resource for specified path.
-    pub fn path<P: IntoPattern>(
+    pub fn path<P: IntoPatterns>(
         &mut self,
         path: P,
         resource: T,