# The grammar defines expressions in the following forms:
# TAG - search blog posts that contain the tag;
# The grammar defines expressions in the following forms:
# TAG - search blog posts that contain the tag;
# This is a simple version of the grammar and it allows
# rather stupid expressions, like (TAG) or ((TAG)) or !(!(TAG)).
# This is a simple version of the grammar and it allows
# rather stupid expressions, like (TAG) or ((TAG)) or !(!(TAG)).