diff --git a/lib/blink.js b/lib/blink.js
index c391a9f..83ee221 100644
--- a/lib/blink.js
+++ b/lib/blink.js
@@ -3,5 +3,5 @@ var marked = require('marked')
 module.exports = function (str) {
   var md = marked(str)
   // TODO
-  return null
-}
\ No newline at end of file
+  return  md.replace(/@@([\w\W]+?)\@@/g, `<blink>$1</blink>`);
+}
diff --git a/lib/capture.js b/lib/capture.js
index a08ee57..8f83737 100644
--- a/lib/capture.js
+++ b/lib/capture.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TODO
-}
\ No newline at end of file
+  var result=str.match(/\d+/);
+  return result?result[0]:null;
+}
diff --git a/lib/capture_breakword.js b/lib/capture_breakword.js
index a08ee57..b224f95 100644
--- a/lib/capture_breakword.js
+++ b/lib/capture_breakword.js
@@ -1,3 +1,6 @@
 module.exports = function (str) {
   // TODO
-}
\ No newline at end of file
+  var reg=/\bx=(\d+)\b/;
+  var result=reg.exec(str);
+  return result&&result[1];
+}
diff --git a/lib/quantified_group.js b/lib/quantified_group.js
index a08ee57..6c522cb 100644
--- a/lib/quantified_group.js
+++ b/lib/quantified_group.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TODO
-}
\ No newline at end of file
+  var regx=/^(0x[0-9a-fA-F]{2}\s*){8}$/;
+  return regx.test(str);
+}
diff --git a/lib/quotes.js b/lib/quotes.js
index a08ee57..42cee8a 100644
--- a/lib/quotes.js
+++ b/lib/quotes.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TODO
-}
\ No newline at end of file
+  var regx=/\".*?\"/g;
+  return str.match(regx);
+}