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