Question

我想使用John Gruber的正则表达式（http://daringfireball.net/2010/07/improved_regex_for_matching_urls）来匹配文本块中的复杂URL。正则表达式非常复杂（正如任务一样，请参阅regex to find url in a text）。

我的问题是我不能使用R：

x <-   c("http://foo.com/blah_blah",
        "http://foo.com/blah_blah/",
        "(Something like http://foo.com/blah_blah)",
        "http://foo.com/blah_blah_(wikipedia)",
         "http://foo.com/more_(than)_one_(parens)",
         "(Something like http://foo.com/blah_blah_(wikipedia))",
         "http://foo.com/blah_(wikipedia)#cite-1",
         "http://foo.com/blah_(wikipedia)_blah#cite-1",
         "http://foo.com/unicode_(✪)_in_parens",
         "http://foo.com/(something)?after=parens",
         "http://foo.com/blah_blah.",
         "http://foo.com/blah_blah/.",
         "<http://foo.com/blah_blah>",
         "<http://foo.com/blah_blah/>",
         "http://foo.com/blah_blah,",
         "http://www.extinguishedscholar.com/wpglob/?p=364.",
         "http://✪df.ws/1234",
         "rdar://1234",
         "rdar:/1234",
         "x-yojimbo-item://6303E4C1-6A6E-45A6-AB9D-3A908F59AE0E",
         "message://%3c330e7f840905021726r6a4ba78dkf1fd71420c1bf6ff@mail.gmail.com%3e",
         "http://➡.ws/䨹",
         "www.c.ws/䨹",
         "<tag>http://example.com</tag>",
         "Just a www.example.com link.",
         "http://example.com/something?with,commas,in,url, but not at end",
         "What about <mailto:gruber@daringfireball.net?subject=TEST> (including brokets).",
         "mailto:name@example.com",
         "bit.ly/foo",
         "“is.gd/foo/”",
         "WWW.EXAMPLE.COM",
         "http://www.asianewsphoto.com/(S(neugxif4twuizg551ywh3f55))/Web_ENG/View_DetailPhoto.aspx?PicId=752",
         "http://www.asianewsphoto.com/(S(neugxif4twuizg551ywh3f55))",
         "http://lcweb2.loc.gov/cgi-bin/query/h?pp/horyd:@field(NUMBER+@band(thc+5a46634))")


t <- regexec("\\b((?:[a-z][\\w-]+:(?:/{1,3}|[a-z0-9%])|www\\d{0,3}[.]|[a-z0-9.\\-]+[.][a-z]{2,4}/)(?:[^\\s()<>]+|\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\))+(?:\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\)|[^\\s`!()\\[\\]{};:'".,<>?«»“”‘’]))", x)             

regmatches(x,t)

感谢您的帮助。

Answer 1

我最终使用gregexpr，因为这支持perl=TRUE。在使用Regex for R后，我提出了以下解决方案（使用上面的数据）。

findURL <- function(x){
  t <- gregexpr("(?xi)\\b(
             (?:[a-z][\\w-]+:(?:/{1,3}|[a-z0-9%])|www\\d{0,3}[.]|[a-z0-9.\\-]+[.][a-z]{2,4}/)
             (?:[^\\s\\(\\)<>]+|\\(([^\\s\\(\\)<>]+|(\\([^\\s\\(\\)<>]+\\)))*\\))+
             (?:\\(([^\\s\\(\\)<>]+|(\\([^\\s\\(\\)<>]+\\)))*\\)|[^\\s`!\\(\\)\\[\\]{};:'\\\"\\.,<>\\?«»“”‘’])
             )",x, perl=TRUE, fixed=FALSE)
  regmatches(x,t)
} 

# Find URLs
urls <- findURL(x) 

# Count URLs
count.urls.temp <- lapply(urls, length)    
count.urls <- sum(unlist(count.urls.temp))

我希望这对其他人有帮助。

在文本块（R）中匹配复杂的URL

1 个答案: