JavaScript正则表达式匹配某些字符串，但未能对其他看似相同的字符串

Question

JSFiddle

我使用Facebook的API，从我县的警察局网页日常犯罪报告来拉。他们遵循大多也是标准化的格式，用下面的模式是什么，我都会响起来的，和一些讨厌的矛盾：

1. 标题是3-4线后跟两个新行字符\n\n之间（代码削减了这一点，不属于下面的输出结果）
2. 不同类型的犯罪组合在一起，第一行是描述犯罪类型的大写字符串。每个类别由两个新行字符\n\n分隔。
3. 实际的罪行遵循上述类别标题，每个（大部分时间）由一个新行字符\n
4. 分离作为一个“伪影”的任何的它们从复制和粘贴，几次有各种Unicode字符替换连字符，包括\u2013，\u2014和\u2015
5. 报道开始字符串“BEAT”，或在极少数情况下所有罪行“垮掉”

是我遇到的问题是，有时下面的代码捕获一个类别标题det在上面＃2中，但在其他帖子中，（似乎）完全相同的字符串和情况并没有被捕获。我使用在服务角代码可以看出下面

me.parsePosts = function() { 
    var posts = facebookService.getRandomPosts(); // Just a method to return 5 random reports for now 
    angular.forEach(posts, function(post) { 
     // Some reports are incorrectly double spaced and inconsistent 
     // with spacing and capitalization 
     var fixedPost = post.message 
          .replace(/^Beat/, 'BEAT') // They were a little inconsistent back in the day 
          .replace('\n\n###', '') // All posts end with a useless ### 
          .replace('\u2013', '-') // Pesky unicode characters! 
          .replace('\u2014', '-') 
          .replace('\u2015', '-') 
          .replace('\n\nARRESTED', '\nARRESTED') // would help if this was consistent 
          .replace(/(?:\\[rn ]|[\r\n ]+)BEAT/gi, '\nBEAT'), // same with the reports... 
      postSplit = fixedPost.split('\n\n'), // split up the post into potential categories 
      header = postSplit.splice(0,1); // I don't want the standard header of the post 

     // Pass in postSplit .join()'d back together for debugging 
     me.getCategoriesFromPost(postSplit, postSplit.join('\n\n')); 
    }); 
}; 

me.getCategoriesFromPost = function(postArray, post) { 
    var categoryRegexp = /[A-Z\-&\/: ]+$/, 
     categories = [], uniqCategories = []; 

    angular.forEach(postArray, function(a) { 
     var split = a.split('\n'), // Extract the category from the list of crimes 
      potentialCategory = split[0].trim(); // There's often an unwanted trailing space 

     if (potentialCategory.match(categoryRegexp)) { 
      categories.push(potentialCategory); 
     } 
    }); 

    // Every blue moon they repost a category twice, I just want one 
    // and I'll merge the two together afterwards 
    uniqCategories = categories.filter(function(a,b) { 
     return categories.indexOf(a) == b; 
    }); 

    console.log(uniqCategories); // log off all the categories in the post 
    console.log(post); // Display the actual post so i can visibly verify it all worked 
}; 

因此，作为一个例子，在一个交：

console.log(uniqCategories);（original raw text as received from facebookService.getRandomPosts()）：

BURGLARY COMMERCIAL 
BEAT E1 SPRINT WIRELESS, 7300 ASSATEAGUE DR, 3/19 0426: Unknown suspect(s) gained entry to the business by breaking the glass door. The suspect(s) stole electronics. 14-25638 
BEAT D6 MONTPELIER LIQUORS, 7500 MONTPELIER RD, 3/19 0513: Unknown suspect(s) gained entry to the business by breaking the glass door. The suspect(s) stole liquor, lottery tickets, and an ATM machine. 14-25641 
BEAT D4 MACY’S, 10300 LITTLE PATUXENT PKWY, 3/19 0501: Two unknown male suspects, wearing masks, gained entry to the business by breaking the glass door. The suspects were interrupted by a store employee and fled without taking anything. 14-25642 
SUSPECT VEHICLE: black Dodge pickup 

BURGLARY NON COMMERCIAL 
BEAT B3 6600 ASPERN DR, 3/17 2354: Four suspects gained entry to the residence via unknown means. No sign of forced entry. 14-25220 
ARRESTED: 
Karlin Lamont Harris, 23, of Pirch Way in Elkridge, charged with fourth-degree burglary 
Steven Lee Hubbard, 29, of Edgewater, charged with fourth-degree burglary 
Jessie Tyler Holt, 22, of Pine Tree Rd in Jessup, charged with fourth-degree burglary 
Brittney Victoria McEnaney, 26, of Pasadena, charged with fourth-degree burglary 
BEAT C1 6900 BENDBOUGH CT, 3/18 1400: Unknown suspect(s) gained entry to the residence via the front door. No sign of forced entry. The suspect(s) stole jewelry. 14-25392 
BEAT B4 7100 DEEP FALLS WAY, 3/18 1100-1440: Unknown suspect(s) gained entry to the residence by forcing a rear basement window. The suspect(s) stole jewelry and electronics. 14-25404 

VEHICLE THEFT & ATTEMPTS 
BEAT E2 7-11, 9600 WASHINGTON BLVD, 3/18 0409: 
05 Acura Tag 1AV8629 14-25277 (Keys left in vehicle.) 

而且console.log(post);返回

["BURGLARY COMMERCIAL", "BURGLARY NON COMMERCIAL", "VEHICLE THEFT & ATTEMPTS"] 

还在另一篇文章中，console.log(uniqCategories);（original raw text as received from facebookService.getRandomPosts()）：

ROBBERY COMMERCIAL 
BEAT B3 ZIPS DRY CLEANING, 6500 OLD WATERLOO RD, 3/22 1900: An unknown suspect entered the business through an unlocked rear door. The suspect threatened an employee and demanded cash. The employee complied. The suspect fled the business. 14-26959 
SUSPECT: B/M, 5’8-5’9, black hoodie and pants, backpack 

ROBBERY NON COMMERCIAL 
BEAT E7 7-11 PARKING LOT, 9100 MAIER RD, 03/23 1632: Suspect stole cash from an acquaintance and caused an abrasion with an unknown sharp object. Police are investigation the possibility it may be drug related. 14-27243 
SUSPECT: B/M, 5’8, 200 lbs, dreadlocks 

BURGLARY COMMERCIAL 
BEAT E1 MEGATELECOM, 8600 WASHINGTON BLVD #106, 3/22 0933: Unknown suspect(s) gained entry to the business by breaking a window. The suspect(s) stole electronics. 14-26793 
BEAT F3 CATTAIL CREEK COUNTRY CLUB, 3600 CATTAIL CREEK DR, 03/22 1600- 03/23 0630: Unknown suspect(s) gained entry to a garage through an unlocked door. The suspect(s) stole golf carts. 14-27127 

BURGLARY NON COMMERCIAL 
BEAT E2 9300 BREAMORE CT, 03/21 1210 ATTEMPT: Two suspects attempted to gain entry via a rear slider. The resident yelled and the suspects fled, but were later caught by police. 14-26458 
ARRESTED: 
Travis Donte Mackell, 23, of Baltimore, charged with fourth-degree burglary 
Maurice Debuiel Aye, 26, of Baltimore, charged with fourth-degree burglary 
BEAT D3 5500 COLUMBIA RD, 3/21: An unknown suspect gained entry to the residence through an unlocked rear slider. The suspect woke the resident, who ultimately got the suspect to leave. It appears he may have entered the wrong residence. 14-26712 
SUSPECT: B/M, 5’8, 200 lbs 
BEAT B4 7500 HEARTHSIDE WAY, 3/22 1700- 1800: Three unknown black male suspects stole a bicycle, which was unsecured on a bike rack. 14-27185 
BEAT E3 9100 BRYANT AVE, 3/23 2213: Unknown suspects gained entry to the residence by prying open the kitchen window. Nothing appeared to be taken. 14-27308 
BEAT B3 8000 KEETON RD, 3/23 1930- 2230: Unknown suspect(s) gained entry to the residence through an unlocked window. The suspect(s) stole a computer and jewelry. 14-27314 
BEAT A3 9000 FREDERICK RD, 3/23 0205: The suspect kicked in an acquaintance’s door after a verbal altercation and assaulted him. 14-27361 
ARRESTED: Michael Wilson Sittig, 34, of Frederick Road in Ellicott City, charged with second-degree assault, third- and fourth-degree burglary, malicious destruction of property, and disorderly conduct 

VEHICLE THEFT & ATTEMPTS 
BEAT D2 5100 ELIOTS OAK DR, 03/22 2130- 3/23 0700: 
12 Hyundai Sonata Red MD 5AN2945 14-27135 

和console.log(post)只返回：

["ROBBERY COMMERCIAL", "VEHICLE THEFT & ATTEMPTS"] 

我希望它返回["ROBBERY COMMERCIAL", "ROBBERY NON COMMERCIAL", "BURGLARY COMMERCIAL", "BURGLARY NON COMMERCIAL", "VEHICLE THEFT & ATTEMPTS"]

在这种情况下，很显然，我的代码前者的实例相匹配的BURGLARY COMMERCIAL和BURGLARY NON COMMERCIAL，但不是后者。是什么赋予了？另外，请随时纠正我，告诉我我在.replace()的墙上做的都是错的，如果有的话，还有更好的办法。感谢一帮帮忙！

Answer 1

你被你的分裂之前错过了几个分隔符的替代品。即，我添加：

post.message 
... 
.replace(/\s*\n\s\n/g, '\n\n') 
.replace(/\s BEAT/g, 'BEAT') ... 

参见updated fiddle

TL; DR;（更新基于评论）

如果你看一下原来replace(...)函数调用后的消息和.split('\n\n')之前，他们中的一些以新行具有在最后跟着一个空格，然后又空白，新队。

没有你原来replace()走上的照顾。此外，一些只有换行符，空白，换行符模式（&为什么正则表达式中的第一个空格有一个*）。然后，邮件中的一些关键字BEAT前面有一个或多个空格，因此我们将删除这些以确保BEAT始终以换行符开头。

如果未注释掉小提琴日志线和注释掉此修复程序，你会看到在每一步元素的数组。

在其中的一个，你会看到一个数组元素不仅包含了我们所期望的（一个报告），但下一个类别被嵌入有作为（这就是为什么你会看到更少）。

然后，我只是想看看有什么是对那些行结尾不同，检查是否replace()功能照顾他们的split(...)调用之前...

让我知道如果你要我更好地解释它。

Answer 2

String.replace取代第一次发生。您需要用正则表达式更改所有String.replace以替换所有的事件。像这样的东西（虽然我不知道的unicode字符在正则表达式的工作方式）：

post.message 
    .replace(/^Beat/ig, 'BEAT') // They were a little inconsistent back in the day 
    .replace('/\n\n###/g', '') // All posts end with a useless ### 
    .replace('/\u2013/g', '-') // Pesky unicode characters! 
    .replace('/\u2014/g', '-') 
    .replace('/\u2015/g', '-') 
    .replace('/\n\nARRESTED/g', '\nARRESTED') // would help if this was consistent 
    .replace(/(?:\\[rn ]|[\r\n ]+)BEAT/gi, '\nBEAT'), // same with the reports...