Changed multiline string literals
Better method name and fixed regexps for IE
More test cases
Don't rely on multiline in other tests
Handle escaped backslashes
Merge pull request #3246 from xixixao/issue3229

Implements #3229 - Changed multiline string literals
Fix multiple escaped backslashes in literal strings
Merge pull request #3250 from xixixao/issue3229

Fix multiple escaped backslashes in literal strings