diff --git a/lib/blink.js b/lib/blink.js
index c391a9f..5ad9975 100644
--- a/lib/blink.js
+++ b/lib/blink.js
@@ -2,6 +2,5 @@ var marked = require('marked')
 
 module.exports = function (str) {
   var md = marked(str)
-  // TODO
-  return null
+  return md.replace(/@@([^@@]+)@@/g,'<blink>$1</blink>')
 }
\ No newline at end of file
diff --git a/lib/capture.js b/lib/capture.js
index a08ee57..8ac04e6 100644
--- a/lib/capture.js
+++ b/lib/capture.js
@@ -1,3 +1,3 @@
 module.exports = function (str) {
-  // TODO
+  return str.match(/(?<=x=)\d+/)
 }
\ No newline at end of file
diff --git a/lib/capture_breakword.js b/lib/capture_breakword.js
index a08ee57..5117320 100644
--- a/lib/capture_breakword.js
+++ b/lib/capture_breakword.js
@@ -1,3 +1,4 @@
 module.exports = function (str) {
-  // TODO
+  var matches = /^(.*\s+)?x=([\d]+)(\s+.*)?$/g.exec(str)
+  return matches ? matches[2] : null;
 }
\ No newline at end of file
diff --git a/lib/quantified_group.js b/lib/quantified_group.js
index a08ee57..eaa8810 100644
--- a/lib/quantified_group.js
+++ b/lib/quantified_group.js
@@ -1,3 +1,3 @@
 module.exports = function (str) {
-  // TODO
+  return /^(0x[\da-fA-F]{2}\s*){8}$/g.test(str)
 }
\ No newline at end of file
diff --git a/lib/quotes.js b/lib/quotes.js
index a08ee57..99d154c 100644
--- a/lib/quotes.js
+++ b/lib/quotes.js
@@ -1,3 +1,3 @@
 module.exports = function (str) {
-  // TODO
+  return str.match(/\"[^\"]*\"/g)
 }
\ No newline at end of file