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// Regexps to match html elements
'use strict';
var attr_name = '[a-zA-Z_:][a-zA-Z0-9:._-]*';
var unquoted = '[^"\'=<>`\\x00-\\x20]+';
var single_quoted = "'[^']*'";
var double_quoted = '"[^"]*"';
var attr_value = '(?:' + unquoted + '|' + single_quoted + '|' + double_quoted + ')';
var attribute = '(?:\\s+' + attr_name + '(?:\\s*=\\s*' + attr_value + ')?)';
var open_tag = '<[A-Za-z][A-Za-z0-9\\-]*' + attribute + '*\\s*\\/?>';
var close_tag = '<\\/[A-Za-z][A-Za-z0-9\\-]*\\s*>';
var comment = '<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->';
var processing = '<[?].*?[?]>';
var declaration = '<![A-Z]+\\s+[^>]*>';
var cdata = '<!\\[CDATA\\[[\\s\\S]*?\\]\\]>';
var HTML_TAG_RE = new RegExp('^(?:' + open_tag + '|' + close_tag + '|' + comment +
'|' + processing + '|' + declaration + '|' + cdata + ')');
var HTML_OPEN_CLOSE_TAG_RE = new RegExp('^(?:' + open_tag + '|' + close_tag + ')');
module.exports.HTML_TAG_RE = HTML_TAG_RE;
module.exports.HTML_OPEN_CLOSE_TAG_RE = HTML_OPEN_CLOSE_TAG_RE;