return value of the function re.escape called with an argument BLOCK_TAG_START, return value of the function re.escape called with an argument BLOCK_TAG_END, return value of the function re.escape called with an argument VARIABLE_TAG_START, return value of the function re.escape called with an argument VARIABLE_TAG_END, return value of the function re.escape called with an argument COMMENT_TAG_START, and return value of the function re.escape called with an argument COMMENT_TAG_END, substitute the result for tag_re. libraries is an empty dictionary.
libraries = { }