Variable: org-tag-line-re
org-tag-line-re is a variable defined in org.el.gz.
Value
"^\\*+ \\(?:.*[ ]\\)?\\(:\\([[:alnum:]_@#%:]+\\):\\)[ ]*$"
Documentation
Regexp matching tags in a headline.
Tags are stored in match group 1. Match group 2 stores the tags without the enclosing colons.
Source Code
;; Defined in /usr/src/emacs/lisp/org/org.el.gz
(defconst org-tag-line-re
"^\\*+ \\(?:.*[ \t]\\)?\\(:\\([[:alnum:]_@#%:]+\\):\\)[ \t]*$"
"Regexp matching tags in a headline.
Tags are stored in match group 1. Match group 2 stores the tags
without the enclosing colons.")