diff --git a/lib/blink.js b/lib/blink.js
index c391a9f..5724cc8 100644
--- a/lib/blink.js
+++ b/lib/blink.js
@@ -1,7 +1,7 @@
 var marked = require('marked')
 
 module.exports = function (str) {
-  var md = marked(str)
+  var md = marked(str);
   // TODO
-  return null
+  return md.replace(/@@(.*?)@@/g, `<blink>$1</blink>`);
 }
\ No newline at end of file
diff --git a/lib/capture.js b/lib/capture.js
index a08ee57..1770b34 100644
--- a/lib/capture.js
+++ b/lib/capture.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TODO
+  const res = str.match(/\=(\d+)/);
+  return res ? res[1] : null;
 }
\ No newline at end of file
diff --git a/lib/capture_breakword.js b/lib/capture_breakword.js
index a08ee57..bb96b8d 100644
--- a/lib/capture_breakword.js
+++ b/lib/capture_breakword.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TODO
+  const res = /\bx=(\d+)\b/.exec(str);
+  return res ? res[1] : null;
 }
\ No newline at end of file
diff --git a/lib/quantified_group.js b/lib/quantified_group.js
index a08ee57..6ebc363 100644
--- a/lib/quantified_group.js
+++ b/lib/quantified_group.js
@@ -1,3 +1,4 @@
 module.exports = function (str) {
   // TODO
+    return /^(0x[a-fA-F0-9]{2}\s*){8}$/.test(str);
 }
\ No newline at end of file
diff --git a/lib/quotes.js b/lib/quotes.js
index a08ee57..bc2e677 100644
--- a/lib/quotes.js
+++ b/lib/quotes.js
@@ -1,3 +1,4 @@
 module.exports = function (str) {
   // TODO
+  return str.match(/\".*?\"/g);
 }
\ No newline at end of file