node / io中复杂的正则expression式提取

有我尝试使用的图书馆的Twitter文本。 它有很多在运行时计算的复杂正则expression式。 我不需要所有的库，所以我决定只使用它的一些正则expression式。

所以我有一个脚本来提取它并保存到另一个js文件：

var _ = require('lodash'); var fs = require('fs'); var twitterText = require('twitter-text'); // 1.11.0 (latest) var content = [ '/**', ' * @preserve https://github.com/twitter/twitter-text-js', ' */', 'var regexps = { };' ]; _.forEach({ url: 'extractUrl', // <- this regexp is the problem hash: 'validHashtag', mention: 'validMentionOrList' }, function(twitterTextRegexpName, regexpName) { var regexp = twitterText.regexen[twitterTextRegexpName]; if (undefined === regexp) { throw new Error('Failed to find regexp ' + twitterTextRegexpName); } content.push( 'regexps.' + regexpName + ' = ' + regexp + ';' ); } ); content.push('export default regexps;'); fs.writeFile(targetPath, content.join('\n'), {}, callback); 

所以结果截图：

正如你所看到的URL正则expression式是坏的，我不能使用模块。

 > require('./result'); .../result.js:5 regexps.url = /(((?:[^A-Za-z0-9@＠$#＃‪-‮]|^))((https?:\/\/)?((?:(?:(?:[^\/\! ^ SyntaxError: Invalid regular expression: missing / at exports.runInThisContext (vm.js:53:16) at Module._compile (module.js:393:25) at Object.Module._extensions..js (module.js:428:10) at Module.load (module.js:335:32) at Function.Module._load (module.js:290:12) at Module.require (module.js:345:17) at require (module.js:364:17) at repl:1:1 at REPLServer.defaultEval (repl.js:124:27) at bound (domain.js:254:14) 

有什么想法吗？ 试过最新的节点和io。

Answer 1

这个脚本似乎工作（它使用这个包 ）：

 var _ = require('lodash'); var fs = require('fs'); var twitterText = require('twitter-text'); // 1.11.0 (latest) jsStringEscape = require('js-string-escape'); var content = [ '/**', ' * @preserve https://github.com/twitter/twitter-text-js', ' */', 'var regexps = { };' ]; _.forEach({ url: 'extractUrl', // <- this regexp is the problem hash: 'validHashtag', mention: 'validMentionOrList' }, function(twitterTextRegexpName, regexpName) { var regexp = twitterText.regexen[twitterTextRegexpName]; if (undefined === regexp) { throw new Error('Failed to find regexp ' + twitterTextRegexpName); } var regexpStr = jsStringEscape(regexp.toString()); var regexpRegexp = /\/(.*)\/([^\/]*)/; // :) var result = regexpStr.match(regexpRegexp); var regexpBody = result[1]; var regexpModifiers = result[2]; content.push( 'regexps.' + regexpName + ' = new RegExp("' + regexpBody + '","' + regexpModifiers + '");' ); } ); content.push('module.exports = regexps;'); fs.writeFile("./out.js", content.join('\n'), {}); 

输出：

 node > var r = require("./out.js"); undefined > "www.google.com".match(r.url) [ 'www.google.com' ] > "something".match(r.url) null 

由此产生的urls正则expression式从原始包中传递这些testing：

testingURL中的无效字符 （结果应为空）：

 var r = require("./out.js"); var invalidChars = ['\u202A', '\u202B', '\u202C', '\u202D', '\u202E']; for (var i = 0; i < invalidChars.length; i++) { console.log(("http://twitt" + invalidChars[i] + "er.com").match(r.url)); } // Result: // null // null // null // null // null 

提取urltesting

 > var r = require("./out.js"); > var message_with_hyphenated_url = "Message with hyphenated-url.com"; undefined > var message_with_www_hyphenated_url = "Message with www.123-hyphenated-url.com"; undefined > message_with_hyphenated_url.match(r.url) [ ' hyphenated-url.com' ] > message_with_www_hyphenated_url.match(r.url) [ ' www.123-hyphenated-url.com' ] // Load original regex: > var twitterText = require('twitter-text'); undefined > var rr = twitterText.regexen["extractUrl"]; undefined > message_with_hyphenated_url.match(rr) [ ' hyphenated-url.com' ] > message_with_www_hyphenated_url.match(rr) [ ' www.123-hyphenated-url.com' ] // The same results as with original regex.