Fixed IE8 regex compatability

src/subParsers/italicsAndBold.js

@@ -6,8 +6,8 @@ showdown.subParser('italicsAndBold', function (text, options, globals) {
   if (options.literalMidWordUnderscores) {
     //underscores
     // Since we are consuming a \s character, we need to add it
-    text = text.replace(/(^|\s|>|\b)__(?=\S)([^]+?)__(?=\b|<|\s|$)/gm, '$1<strong>$2</strong>');
-    text = text.replace(/(^|\s|>|\b)_(?=\S)([^]+?)_(?=\b|<|\s|$)/gm, '$1<em>$2</em>');
+    text = text.replace(/(^|\s|>|\b)__(?=\S)([\s\S]+?)__(?=\b|<|\s|$)/gm, '$1<strong>$2</strong>');
+    text = text.replace(/(^|\s|>|\b)_(?=\S)([\s\S]+?)_(?=\b|<|\s|$)/gm, '$1<em>$2</em>');
     //asterisks
     text = text.replace(/(\*\*)(?=\S)([^\r]*?\S[*]*)\1/g, '<strong>$2</strong>');
     text = text.replace(/(\*)(?=\S)([^\r]*?\S)\1/g, '<em>$2</em>');

src/subParsers/tables.js

@@ -5,7 +5,7 @@ showdown.subParser('tables', function (text, options, globals) {
     return text;
   }
 
-  var tableRgx = /^[ \t]{0,3}\|?.+\|.+\n[ \t]{0,3}\|?[ \t]*:?[ \t]*(?:-|=){2,}[ \t]*:?[ \t]*\|[ \t]*:?[ \t]*(?:-|=){2,}[^]+?(?:\n\n|~0)/gm;
+  var tableRgx = /^[ \t]{0,3}\|?.+\|.+\n[ \t]{0,3}\|?[ \t]*:?[ \t]*(?:-|=){2,}[ \t]*:?[ \t]*\|[ \t]*:?[ \t]*(?:-|=){2,}[\s\S]+?(?:\n\n|~0)/gm;
 
   function parseStyles(sLine) {
     if (/^:[ \t]*--*$/.test(sLine)) {