fix(brocolli): escape special regexp characters when building regexps

Special regexp tokens were allowed unchanged previously, which incorrectly broke the include/exclude behaviour. Now, they're escaped first. Closes angular#1721 Closes angular#1752

Author: caitp

tools/broccoli/tree-differ.spec.ts

@@ -151,6 +151,7 @@ describe('TreeDiffer', () => {
  'dir1': {
  'file-1.ts': mockfs.file({content: 'file-1.ts content', mtime: new Date(1000)}),
  'file-1.cs': mockfs.file({content: 'file-1.cs content', mtime: new Date(1000)}),
+ 'file-1d.cs': mockfs.file({content: 'file-1d.cs content', mtime: new Date(1000)}),
  'file-1.d.cs': mockfs.file({content: 'file-1.d.cs content', mtime: new Date(1000)}),
  'file-2.md': mockfs.file({content: 'file-2.md content', mtime: new Date(1000)}),
  'file-3.ts': mockfs.file({content: 'file-3.ts content', mtime: new Date(1000)}),
@@ -166,7 +167,8 @@ describe('TreeDiffer', () => {
 
  let diffResult = differ.diffTree();
 
- expect(diffResult.changedPaths).toEqual(['file-1.cs', 'file-1.ts', 'file-3.ts']);
+ expect(diffResult.changedPaths)
+ .toEqual(['file-1.cs', 'file-1.ts', 'file-1d.cs', 'file-3.ts']);
 
  // change two files
  testDir['dir1']['file-1.ts'] = mockfs.file({content: 'new content', mtime: new Date(1000)});

tools/broccoli/tree-differ.ts

@@ -22,7 +22,8 @@ export class TreeDiffer {
 
  function combine(prev, curr) {
  if (curr.charAt(0) !== ".") throw new TypeError("Extension must begin with '.'");
- curr = '(' + curr + ')';
+ let kSpecialRegexpChars = /[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g;
+ curr = '(' + curr.replace(kSpecialRegexpChars, '\\$&') + ')';
  return prev ? (prev + '|' + curr) : curr;
  }
  }