Add support for '\\[' and '\\]' as math delimiters, refactoring.

notebook/static/notebook/js/mathjaxutils.js

@@ -59,7 +59,7 @@ define([
 
     // MATHSPLIT contains the pattern for math delimiters and special symbols
     // needed for searching for math in the text input.
-    var MATHSPLIT = /(\$\$?|\\(?:begin|end)\{[a-z]*\*?\}|\\[{}$]|[{}]|(?:\n\s*)+|@@\d+@@|\\\\(?:\(|\)))/i;
+    var MATHSPLIT = /(\$\$?|\\(?:begin|end)\{[a-z]*\*?\}|\\[{}$]|[{}]|(?:\n\s*)+|@@\d+@@|\\\\(?:\(|\)|\[|\]))/i;
 
     //  The math is in blocks i through j, so
     //    collect it into one block and clear the others.
@@ -178,10 +178,10 @@ define([
                     end = block;
                     braces = 0;
                 }
-                else if (block === "\\\\\(") {
-                	start = i;
-                	end = "\\\\\)";
-                	braces = 0;
+                else if (block === "\\\\\(" || block === "\\\\\[") {
+                    start = i;
+                    end = block.slice(-1) === "(" ? "\\\\\)" : "\\\\\]";
+                    braces = 0;
                 }
                 else if (block.substr(1, 5) === "begin") {
                     start = i;
@@ -204,11 +204,20 @@ define([
     //    and clear the math array (no need to keep it around).
     //
     var replace_math = function (text, math) {
-        text = text.replace(/@@(\d+)@@/g, function (match, n) {
-            return math[n]
-            	.replace("\\\\\(", "\\\(")
-            	.replace("\\\\\)", "\\\)");
-        });
+        var math_group_process = function (match, n) {
+            var math_group = math[n];
+
+            if (math_group.substr(0, 3) === "\\\\\("  && math_group.substr(math_group.length - 3) === "\\\\\)") {
+                math_group = "\\\(" + math_group.substring(3, math_group.length - 3) + "\\\)";
+            } else if (math_group.substr(0, 3) === "\\\\\[" && math_group.substr(math_group.length - 3) === "\\\\\]") {
+                math_group = "\\\[" + math_group.substring(3, math_group.length - 3) + "\\\]";
+            }
+            
+            return math_group;
+        };
+
+        text = text.replace(/@@(\d+)@@/g, math_group_process);
+        
         return text;
     };