sgml-start-tag-regex

sgml-start-tag-regex is a variable defined in `sgml-mode.el'.
Its value is

"<[_:[:alpha:]][-_.:[:alnum:]]*\\(?:[^\"'/><]\\|\"[^\"]*\"\\|'[^']*'\\)*"

• This variable may be risky if used as a file-local variable.

Documentation:
Regular expression that matches a non-empty start tag.
Any terminating `>' or `/' is not matched.