Revert "Fix markdown parsing for italic (sstur#254)"

This reverts commit be8c9d3.

This commit causes issues on safari

Author: Nic0S

packages/draft-js-import-markdown/src/MarkdownParser.js

@@ -376,7 +376,7 @@ var inline = {
   reflink: /^!?\[(inside)\]\s*\[([^\]]*)\]/,
   nolink: /^!?\[((?:\[[^\]]*\]|[^\[\]])*)\]/,
   strong: /^__([\s\S]+?)__(?!_)|^\*\*([\s\S]+?)\*\*(?!\*)/,
-  em: /^_([\s\S]+?)(?<!\\)_|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,
+  em: /^\b_((?:__|[\s\S])+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,
   code: /^(`+)\s*([\s\S]*?[^`])\s*\1(?!`)/,
   br: /^ {2,}\n(?!\s*$)/,
   del: noop,

packages/draft-js-import-markdown/src/__tests__/stateFromMarkdown-test.js

@@ -4,10 +4,6 @@ import expect from 'expect';
 import stateFromMarkdown from '../stateFromMarkdown';
 import {convertToRaw} from 'draft-js';
 
-
-import expectedRawData from '../test-fixtures/rawData.js';
-import markdownValues from '../test-fixtures/markdownValues.js';
-
 describe('stateFromMarkdown', () => {
   it('should create content state', () => {
     let markdown = 'Hello World';
@@ -253,30 +249,6 @@ describe('stateFromMarkdown', () => {
       ],
     });
   });
-  it('should correctly parse italic words with markdown', () => {
-    let contentState = stateFromMarkdown(markdownValues.italicTest);
-    let rawContentState = convertToRaw(contentState);
-    let blocks = removeKeys(rawContentState.blocks);
-    expect([expectedRawData.italicTest]).toEqual(blocks);
-  });
-  it('should correctly parse italic and bold words with markdown', () => {
-    let contentState = stateFromMarkdown(markdownValues.italicAndBoldTest);
-    let rawContentState = convertToRaw(contentState);
-    let blocks = removeKeys(rawContentState.blocks);
-    expect([expectedRawData.italicAndBoldTest]).toEqual(blocks);
-  });
-  it('should correctly parse italic words with the "_" character in markdown', () => {
-    let contentState = stateFromMarkdown(markdownValues.italicEscapeUnderscoreChar);
-    let rawContentState = convertToRaw(contentState);
-    let blocks = removeKeys(rawContentState.blocks);
-    expect([expectedRawData.italicEscapeUnderscoreChar]).toEqual(blocks);
-  });
-  it('should correctly parse italic and Bold words with the "*" character in markdown', () => {
-    let contentState = stateFromMarkdown(markdownValues.italicEscapeBoldChar);
-    let rawContentState = convertToRaw(contentState);
-    let blocks = removeKeys(rawContentState.blocks);
-    expect([expectedRawData.italicEscapeBoldChar]).toEqual(blocks);
-  });
 });
 
 function removeKeys(blocks) {