fix false positive flagging of standalone autolinks as self-closing html

fixes #208

__snapshots__/index.spec.js.snap

@@ -3126,6 +3126,42 @@ exports[`markdown-to-jsx compiler links should handle autolink style 1`] = `
 
 `;
 
+exports[`markdown-to-jsx compiler links should handle autolinks after a paragraph (regression) 1`] = `
+
+<div data-reactroot>
+  <p>
+    <strong>
+      autolink
+    </strong>
+    style
+  </p>
+  <p>
+    <a href="https://google.com">
+      https://google.com
+    </a>
+  </p>
+</div>
+
+`;
+
+exports[`markdown-to-jsx compiler links should handle mailto autolinks after a paragraph 1`] = `
+
+<div data-reactroot>
+  <p>
+    <strong>
+      autolink
+    </strong>
+    style
+  </p>
+  <p>
+    <a href="mailto:[email protected]">
+      [email protected]
+    </a>
+  </p>
+</div>
+
+`;
+
 exports[`markdown-to-jsx compiler links should sanitize links containing JS expressions 1`] = `
 
 <a data-reactroot>

index.js

@@ -140,7 +140,7 @@ const HTML_COMMENT_R = /^<!--.*?-->/;
  */
 const HTML_CUSTOM_ATTR_R = /^(data|aria|x)-[a-z_][a-z\d_.-]*$/;
 
-const HTML_SELF_CLOSING_ELEMENT_R = /^ *<([A-Za-z][\w:]*)\s*((?:<.*?>|[^>])*)>(?!<\/\1>)\s*/;
+const HTML_SELF_CLOSING_ELEMENT_R = /^ *<([A-Za-z][\w:]*)(?:\s+((?:<.*?>|[^>])*))?>(?!<\/\1>)\s*/;
 const INTERPOLATION_R = /^\{.*\}$/;
 const LINK_AUTOLINK_BARE_URL_R = /^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])/;
 const LINK_AUTOLINK_MAILTO_R = /^<([^ >]+@[^ >]+)>/;
@@ -1088,7 +1088,7 @@ export function compiler(markdown, options) {
             order: PARSE_PRIORITY_HIGH,
             parse(capture /*, parse, state*/) {
                 return {
-                    attrs: attrStringToMap(capture[2]),
+                    attrs: attrStringToMap(capture[2] || ''),
                     tag: capture[1],
                 };
             },

index.spec.js

@@ -322,6 +322,30 @@ describe('markdown-to-jsx', () => {
                 expect(root.innerHTML).toMatchSnapshot();
             });
 
+            it('should handle autolinks after a paragraph (regression)', () => {
+                render(
+                    compiler(`
+**autolink** style
+
+<https://google.com>
+                    `)
+                );
+
+                expect(root.innerHTML).toMatchSnapshot();
+            });
+
+            it('should handle mailto autolinks after a paragraph', () => {
+                render(
+                    compiler(`
+**autolink** style
+
+<mailto:[email protected]>
+                    `)
+                );
+
+                expect(root.innerHTML).toMatchSnapshot();
+            });
+
             it('should handle a mailto autolink', () => {
                 render(compiler('<mailto:[email protected]>'));