Create AutoLink.md

snippets/AutoLink.md

@@ -0,0 +1,38 @@
+### AutoLink
+
+Renders a string as plaintext, with URLs converted to appropriate `<a>` elements.
+
+Use `String.prototype.split()` and `String.prototype.match()` with a regular expression to find URLs in a string.
+Return a  `<React.Fragment>` with matched URLs rendered as `<a>` elements, dealing with missing protocol prefixes if necessary, and the rest of the string rendered as plaintext.
+
+```jsx
+function AutoLink({ text }) {
+  const delimiter = /((?:https?:\/\/)?(?:(?:[a-z0-9]?(?:[a-z0-9\-]{1,61}[a-z0-9])?\.[^\.|\s])+[a-z\.]*[a-z]+|(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3})(?::\d{1,5})*[a-z0-9.,_\/~#&=;%+?\-\\(\\)]*)/gi;
+
+  return (
+    <React.Fragment>
+      {text.split(delimiter).map(word => {
+        let match = word.match(delimiter);
+        if (match) {
+          let url = match[0];
+          return (
+            <a href={url.startsWith("http") ? url : `http://${url}`}>{url}</a>
+          );
+        }
+        return word;
+      })}
+    </React.Fragment>
+  );
+}
+```
+
+```jsx
+ReactDOM.render(
+  <AutoLink text='foo bar baz http://example.org bar' />,
+  document.getElementById('root')
+);
+```
+
+<!-- tags: string,fragment,functional -->
+
+<!-- expertise: 2 -->