Add regex for js introduction

Setting up simple regex sample
sicktastic · May 9, 2016 · 77e7a99 · 77e7a99
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diff --git a/regular-expressions/.introduction.html.swp b/regular-expressions/.introduction.html.swp
diff --git a/regular-expressions/.introduction.js.swp b/regular-expressions/.introduction.js.swp
diff --git a/regular-expressions/introduction.html b/regular-expressions/introduction.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width">
+    <title>Regular Expression Introduction</title>
+    <style>
+      pre {
+        line-height: 2;
+      } 
+      span {
+        background-color: #eee;
+        padding: 1px;
+        outline: 1px solid #999;
+      }
+    </style>
+  </head>
+  <body>
+    <pre></pre>
+    <script src="introduction.js"></script>
+</html>
diff --git a/regular-expressions/introduction.js b/regular-expressions/introduction.js
@@ -0,0 +1,19 @@
+"use strict";
+
+const output = (str, regex, target) => {
+  target.innerHTML(regex, str => '<span>{str}</span>');
+}
+
+var str = "Is this This?";
+
+// var regex = new RegExp("is", "g);
+// g = global, i=ignore case
+var regex = /is/gi;
+
+
+// console.log(regex.test(str));
+// console.log(regex.exec(str))
+// console.log(str.match(regex))
+// console.log(str.replace(regex, str => "XX"))
+
+output(str, regex, document.querySelector('pre'))