Merge pull request #388 from Chalarangelo/escape-unescape-string

[FEATURE] Add escape/unescape string

snippets/escapeHTML.md

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+### escapeHTML
+
+Escapes a string for use in HTML.
+
+Use `String.replace()` with a regex that matches the characters that need to be escaped, using a callback function to replace each character instance with its associated escaped character using a dictionary (object).
+
+```js
+const escapeHTML = str => str.replace(/[&<>'"]/g, tag => ({
+    '&': '&amp;',
+    '<': '&lt;',
+    '>': '&gt;',
+    '\'': '&#39;',
+    '"': '&quot;'
+  })[tag] || tag);
+```
+
+```js
+escapeHTML('<a href="#">Me & you</a>'); // '&lt;a href=&quot;#&quot;&gt;Me &amp; you&lt;/a&gt;'
+```

snippets/unescapeHTML.md

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+### unescapeHTML
+
+Unescapes escaped HTML characters.
+
+Use `String.replace()` with a regex that matches the characters that need to be escaped, using a callback function to replace each escaped character instance with its associated unescaped character using a dictionary (object).
+
+```js
+const unescapeHTML = str => str.replace(/&|<|>|'|"/g, tag => ({
+    '&': '&',
+    '&lt;': '<',
+    '&gt;': '>',
+    '&#39;': '\'',
+    '&quot;': '"'
+  })[tag] || tag);```
+```js
+unescapeHTML('&lt;a href=&quot;#&quot;&gt;Me &amp; you&lt;/a&gt;'); // '<a href="#">Me & you</a>'
+```