diff --git a/.gitignore b/.gitignore
index b512c09..420f7de 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
-node_modules
\ No newline at end of file
+node_modules
+yarn-error.log*
+yarn.lock*
\ No newline at end of file
diff --git a/lib/meta.js b/lib/meta.js
index a08ee57..410448b 100644
--- a/lib/meta.js
+++ b/lib/meta.js
@@ -1,3 +1,5 @@
 module.exports = function (str) {
   // TODO
+  const reg = /\.$/;
+  return reg.test(str);
 }
\ No newline at end of file
diff --git a/lib/quantifier.js b/lib/quantifier.js
index a08ee57..b41efac 100644
--- a/lib/quantifier.js
+++ b/lib/quantifier.js
@@ -1,3 +1,4 @@
 module.exports = function (str) {
   // TODO
+  return /^\d+(\.jpe?g)$/.test(str);
 }
\ No newline at end of file
diff --git a/lib/split.js b/lib/split.js
index a08ee57..92f472c 100644
--- a/lib/split.js
+++ b/lib/split.js
@@ -1,3 +1,4 @@
 module.exports = function (str) {
   // TODO
+  return str.split(/\s*,\s*/);
 }
\ No newline at end of file