edx/edx-platform — pull request #1948 by auraz (2013-12-13 12:18:43+00:00)
Title: Anton/allow arbitrary regex in stringresponse

This is for https://edx-wiki.atlassian.net/browse/BLD-475: Allow arbitrary regex inside of string response and updates for multiple answers for string response.

Add mode to markdown editor: if first answer is started with | -> that will be regexp.

@polesye please review