diff --git a/Demo/Snippet.swift b/Demo/Snippet.swift
index 8886fa1..6184889 100644
--- a/Demo/Snippet.swift
+++ b/Demo/Snippet.swift
@@ -24,7 +24,7 @@ func test0() -> NSAttributedString {
 
 func test1() -> NSAttributedString {
     let b = Style("b").font(.boldSystemFont(ofSize: 20)).foregroundColor(.red)
-    let str = "Hello <b>World</b>!!!".style(tags: b)
+    let str = "Hello <b>W🌎rld</b>!!!".style(tags: b)
         .styleAll(Style.font(.systemFont(ofSize: 20)))
         .attributedString
     return str
@@ -66,7 +66,7 @@ func test4() -> NSAttributedString {
 
 func test5() -> NSAttributedString {
     
-    let str = "<r>first</r><g>second</g><b>third</b>".style(tags:
+    let str = "<r>first</r><g>sec⚽️nd</g><b>third</b>".style(tags:
         Style("r").foregroundColor(.red),
                                                             Style("g").foregroundColor(.green),
                                                             Style("b").foregroundColor(.blue)).attributedString
diff --git a/Demo/SnippetsViewController.swift b/Demo/SnippetsViewController.swift
index 13510e8..cff3e1e 100644
--- a/Demo/SnippetsViewController.swift
+++ b/Demo/SnippetsViewController.swift
@@ -30,8 +30,6 @@ class SnippetsViewController: UIViewController {
     
     override func viewDidLoad() {
         super.viewDidLoad()
-        
-        
         view.addSubview(tableView)
     }
     
diff --git a/Demo/TTTAttributedLabelDemoViewController.swift b/Demo/TTTAttributedLabelDemoViewController.swift
index 8957ca9..c6b7131 100644
--- a/Demo/TTTAttributedLabelDemoViewController.swift
+++ b/Demo/TTTAttributedLabelDemoViewController.swift
@@ -43,14 +43,11 @@ class TTTAttributedLabelDemoViewController: UIViewController {
         aka.detections.forEach { detection in
             switch detection.type {
             case .hashtag:
-                let startIndex = aka.string.index(aka.string.startIndex, offsetBy: detection.range.lowerBound + 1)
-                let endIndex = aka.string.index(aka.string.startIndex, offsetBy: detection.range.lowerBound + detection.range.count - 1)
-                
-                let hashtag = (aka.string[startIndex...endIndex])
-                label.addLink(to: URL(string: "https://twitter.com/hashtag/\(hashtag)"), with: NSRange(detection.range))
+                let hashtag = (aka.string[detection.range])
+                label.addLink(to: URL(string: "https://twitter.com/hashtag/\(hashtag)"), with: NSRange(detection.range, in: aka.string))
             case .tag(let tag):
                 if tag.name == "a", let href = tag.attributes["href"] {
-                    label.addLink(to: URL(string: href), with: NSRange(detection.range))
+                    label.addLink(to: URL(string: href), with: NSRange(detection.range, in: aka.string))
                 }
             default:
                 break
diff --git a/README.md b/README.md
index 7ad63e7..5ba7edf 100644
--- a/README.md
+++ b/README.md
@@ -128,15 +128,11 @@ let aka = "If only Bradley's arm was longer. Best photo ever. #oscars <a href=\"
 aka.detections.forEach { detection in
     switch detection.type {
     case .hashtag:
-        let startIndex = aka.string.index(aka.string.startIndex, offsetBy: detection.range.lowerBound + 1)
-        let endIndex = aka.string.index(aka.string.startIndex, offsetBy: detection.range.lowerBound + detection.range.count - 1)
-
-        let hashtag = (aka.string[startIndex...endIndex])
-
-        label.addLink(to: URL(string: "https://twitter.com/hashtag/\(hashtag)"), with: NSRange(detection.range))
+        let hashtag = (aka.string[detection.range])
+        label.addLink(to: URL(string: "https://twitter.com/hashtag/\(hashtag)"), with: NSRange(detection.range, in: aka.string))
     case .tag(let tag):
         if tag.name == "a", let href = tag.attributes["href"] {
-            label.addLink(to: URL(string: href), with: NSRange(detection.range))
+            label.addLink(to: URL(string: href), with: NSRange(detection.range, in: aka.string))
         }
     default:
         break
@@ -159,7 +155,7 @@ extension XXX: TTTAttributedLabelDelegate {
 
 Current version is compatible with:
 
-* Swift 3.0+
+* Swift 4.0+
 * iOS 8.0 or later
 * tvOS 9.0 or later
 * watchOS 2.0 or later
diff --git a/Sources/Atributika.swift b/Sources/Atributika.swift
index 67c2f8b..c1f278f 100644
--- a/Sources/Atributika.swift
+++ b/Sources/Atributika.swift
@@ -36,7 +36,7 @@ public enum DetectionType {
 public struct Detection {
     public let type: DetectionType
     public let style: Style
-    public let range: Range<Int>
+    public let range: Range<String.Index>
 }
 
 public protocol AtributikaProtocol {
@@ -52,7 +52,7 @@ extension AtributikaProtocol {
         
         for d in detections {
             if d.style.attributes.count > 0 {
-                attributedString.addAttributes(d.style.attributes, range: NSRange(d.range))
+                attributedString.addAttributes(d.style.attributes, range: NSRange(d.range, in: string))
             }
         }
         
@@ -105,7 +105,7 @@ extension AtributikaProtocol {
         return Atributika(string: string, detections: detections + ds, baseStyle: baseStyle)
     }
     
-    public func style(range: Range<Int>, style: Style) -> Atributika {
+    public func style(range: Range<String.Index>, style: Style) -> Atributika {
         let d = Detection(type: .none, style: style, range: range)
         return Atributika(string: string, detections: detections + [d], baseStyle: baseStyle)
     }
@@ -154,7 +154,7 @@ extension NSAttributedString: AtributikaProtocol {
         var ds: [Detection] = []
         
         enumerateAttributes(in: NSMakeRange(0, length), options: []) { (attributes, range, _) in
-            if let range = Range(range) {
+            if let range = Range(range, in: self.string) {
                 ds.append(Detection(type: .none, style: Style("", attributes), range: range))
             }
         }
diff --git a/Sources/String+Detection.swift b/Sources/String+Detection.swift
index fc87f23..7d59641 100644
--- a/Sources/String+Detection.swift
+++ b/Sources/String+Detection.swift
@@ -15,7 +15,7 @@ public struct Tag {
 
 public struct TagInfo {
     public let tag: Tag
-    public let range: Range<Int>
+    public let range: Range<String.Index>
 }
 
 extension String {
@@ -70,7 +70,7 @@ extension String {
         scanner.charactersToBeSkipped = nil
         var resultString = String()
         var tagsResult = [TagInfo]()
-        var tagsStack = [(Tag, Int)]()
+        var tagsStack = [(Tag, String.Index)]()
         
         while !scanner.isAtEnd {
             
@@ -86,7 +86,7 @@ extension String {
                             if tag.name == "br" {
                                 resultString += "\n"
                             } else {
-                                let resultTextEndIndex = resultString.characters.count
+                                let resultTextEndIndex = resultString.endIndex
                                 
                                 if open {
                                     tagsStack.append((tag, resultTextEndIndex))
@@ -117,23 +117,23 @@ extension String {
         return (resultString, tagsResult)
     }
     
-    public func detectHashTags() -> [Range<Int>] {
+    public func detectHashTags() -> [Range<String.Index>] {
         
         return detect(regex: "[#]\\w\\S*\\b")
     }
     
-    public func detectMentions() -> [Range<Int>] {
+    public func detectMentions() -> [Range<String.Index>] {
         
         return detect(regex: "[@]\\w\\S*\\b")
     }
     
-    public func detect(regex: String, options: NSRegularExpression.Options = []) -> [Range<Int>] {
+    public func detect(regex: String, options: NSRegularExpression.Options = []) -> [Range<String.Index>] {
         
-        var ranges = [Range<Int>]()
+        var ranges = [Range<String.Index>]()
         
         let dataDetector = try? NSRegularExpression(pattern: regex, options: options)
         dataDetector?.enumerateMatches(in: self, options: [], range: NSMakeRange(0, (self as NSString).length), using: { (result, flags, _) in
-            if let r = result, let range = Range(r.range) {
+            if let r = result, let range = Range(r.range, in: self) {
                 ranges.append(range)
             }
         })
@@ -141,13 +141,13 @@ extension String {
         return ranges
     }
     
-    public func detect(textCheckingTypes: NSTextCheckingTypes) -> [Range<Int>] {
+    public func detect(textCheckingTypes: NSTextCheckingTypes) -> [Range<String.Index>] {
         
-        var ranges = [Range<Int>]()
+        var ranges = [Range<String.Index>]()
         
         let dataDetector = try? NSDataDetector(types: textCheckingTypes)
         dataDetector?.enumerateMatches(in: self, options: [], range: NSMakeRange(0, (self as NSString).length), using: { (result, flags, _) in
-            if let r = result, let range = Range(r.range) {
+            if let r = result, let range = Range(r.range, in: self) {
                 ranges.append(range)
             }
         })
diff --git a/Tests/AtributikaTests/AtributikaTests.swift b/Tests/AtributikaTests/AtributikaTests.swift
index 05d440c..72d7074 100644
--- a/Tests/AtributikaTests/AtributikaTests.swift
+++ b/Tests/AtributikaTests/AtributikaTests.swift
@@ -95,7 +95,7 @@ class AtributikaTests: XCTestCase {
         
         XCTAssertEqual(a.attributedString, reference)
         
-        XCTAssertEqual(a.detections[0].range, 0..<5)
+        XCTAssertEqual(a.detections[0].range, a.string.startIndex..<a.string.index(a.string.startIndex, offsetBy: 5))
         
         if case .tag(let tag) = a.detections[0].type {
             XCTAssertEqual(tag.name, "a")
@@ -264,8 +264,9 @@ class AtributikaTests: XCTestCase {
     }
     
     func testRange() {
+        let str = "Hello World!!!"
         
-        let test = "Hello World!!!".style(range: 0..<5, style: Style("b").font(.boldSystemFont(ofSize: 45))).attributedString
+        let test = "Hello World!!!".style(range: str.startIndex..<str.index(str.startIndex, offsetBy: 5), style: Style("b").font(.boldSystemFont(ofSize: 45))).attributedString
         
         let reference = NSMutableAttributedString(string: "Hello World!!!")
         reference.addAttributes([NSAttributedStringKey.font: Font.boldSystemFont(ofSize: 45)], range: NSMakeRange(0, 5))
@@ -273,6 +274,18 @@ class AtributikaTests: XCTestCase {
         XCTAssertEqual(test, reference)
     }
     
+    func testEmojis() {
+        
+        let test = "Hello <b>W🌎rld</b>!!!".style(tags:
+            Style("b").font(.boldSystemFont(ofSize: 45))
+            ).attributedString
+        
+        let reference = NSMutableAttributedString(string: "Hello W🌎rld!!!")
+        reference.addAttributes([NSAttributedStringKey.font: Font.boldSystemFont(ofSize: 45)], range: NSMakeRange(6, 6))
+        
+        XCTAssertEqual(test,reference)
+    }
+    
 }
 
 #if os(Linux)