# 正则收集

const commentEndRe = /\*\/$/;
const commentStartRe = /^\/\*\*/;
const docblockRe = /^\s*(\/\*\*?(.|\r?\n)*?\*\/)/;
const lineCommentRe = /(^|\s+)\/\/([^\r\n]*)/g;
const ltrimNewlineRe = /^(\r?\n)+/;
const multilineRe = /(?:^|\r?\n) *(@[^\r\n]*?) *\r?\n *(?![^@\r\n]*\/\/[^]*)([^@\r\n\s][^@\r\n]+?) *\r?\n/g;
const propertyRe = /(?:^|\r?\n) *@(\S+) *([^\r\n]*)/g;
const stringStartRe = /(\r?\n|^) *\* ?/g;

var NEWLINES_RE  = /\r[\n\u0085]?|[\u2424\u2028\u0085]/g;
var NULL_RE      = /\u0000/g;

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 + ')');