[英]Java regEx URL matching issue
and as usual thank you in advance. 和往常一样,谢谢你。
I am trying to familiarize myself with regEx and I am having an issue matching a URL. 我正在尝试使自己熟悉regEx,但遇到与URL匹配的问题。
Here is an example URL: 这是一个示例URL:
www.examplesite.com/dir/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html
here is what my regex breakdown looks like: 这是我的正则表达式分解如下:
[site]/[dir]*?/[year]/[month]/[day]/[storyTitle]?/[id]/htmlpage.html
the [id]
is a string 22 characters in length that can be either uppercase or lowercase letters, as well as numbers. [id]
是一个字符串,长度为22个字符,可以是大写或小写字母以及数字。 However, I do not want to extract that from the URL. 但是,我不想从URL中提取出来。 Just clarifying
只是澄清一下
Now, I need to extract two values from this url. 现在,我需要从该URL中提取两个值。
First, I need to extract the dirs(s). 首先,我需要提取目录。 However, the
[dir]
is optional, but also can be as many as wanted. 但是,
[dir]
是可选的,但也可以任意多个。 In other words that parameter could not be there, or it could be dir1/dir2/dir3
..etc . 换句话说,该参数可能不存在,也可能是
dir1/dir2/dir3
..etc。 So, going off my first example : 因此,从我的第一个例子开始:
www.examplesite.com/dir1/dir2/dir3/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html
Here I would need to extract dir1/dir2/dir3
where a dir is a string that is a single word with all lowercase letters (ie sports/mlb/games). 在这里,我需要提取
dir1/dir2/dir3
,其中dir是一个字符串,是一个包含所有小写字母(即sports / mlb / games)的单词。 There are no numbers in the dir, only using that as an example. 目录中没有数字,仅以数字为例。
But in this example of a valid URL: 但是在此有效URL的示例中:
www.examplesite.com/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html
There is no [dir]
so I would not extract anything. 没有
[dir]
所以我不会提取任何东西。 thus, the [dir]
is optional 因此,
[dir]
是可选的
Secondly, I need to extract the [storyTitle]
where the [storyTitle]
is also optional just like the [dir]
above, but however if there is a storyTitle
there can only be one. 其次,我需要提取
[storyTitle]
,其中[storyTitle]
也是可选的,就像上面的[dir]
,但是,如果有一个storyTitle
,则只能有一个。
So going off my previous examples 所以从我以前的例子
www.examplesite.com/dir/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html
would be valid where I need to extract 'title-of-some-story'
where story titles are dash separated strings that are always lowercase. 在需要提取
'title-of-some-story'
故事标题'title-of-some-story'
下有效,其中故事标题是用短划线分隔的字符串,始终为小写。 The example belowis also valid: 以下示例也有效:
www.examplesite.com/dir/2012/06/19/FAQKZjC3veXSalP9zxFgZP/htmlpage.html
In the above example, there is no [storyTitle]
thus making it optional 在上面的示例中,没有
[storyTitle]
因此使其为可选
Lastly, just to be thorough, a URL without a [dir]
and without a [storyTitle]
are also valid. 最后,仅此
[storyTitle]
,没有[dir]
和[storyTitle]
的URL也是有效的。 Example: 例:
www.examplesite.com/2012/06/19/FAQKZjC3veXSalP9zxFgZP/htmlpage.html
Is a valid URL. 是有效的网址。 Any input would be helpful I hope I am clear.
任何输入都会有所帮助,我希望我清楚。
Here is one example that will work. 这是一个可行的例子。
public static void main(String[] args) {
Pattern p = Pattern.compile("(?:http://)?.+?(/.+?)?/\\d+/\\d{2}/\\d{2}(/.+?)?/\\w{22}");
String[] strings ={
"www.examplesite.com/dir1/dir2/4444/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html",
"www.examplesite.com/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html",
"www.examplesite.com/dir/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html",
"www.examplesite.com/dir/2012/06/19/FAQKZjC3veXSalP9zxFgZP/htmlpage.html",
"www.examplesite.com/2012/06/19/FAQKZjC3veXSalP9zxFgZP/htmlpage.html"
};
for (int idx = 0; idx < strings.length; idx++) {
Matcher m = p.matcher(strings[idx]);
if (m.find()) {
String dir = m.group(1);
String title = m.group(2);
if (title != null) {
title = title.substring(1); // remove the leading /
}
System.out.println(idx+": Dir: "+dir+", Title: "+title);
}
}
}
Here is an all regex solution. 这是所有正则表达式的解决方案。
Edit: Allows for http:// 编辑:允许http://
Java source: Java来源:
import java.util.*;
import java.lang.*;
import java.util.regex.*;
class Main
{
public static void main (String[] args) throws java.lang.Exception
{
String url = "http://www.examplesite.com/dir/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html";
String url2 = "www.examplesite.com/dir/dir2/dir3/2012/06/19/FAQKZjC3veXSalP9zxFgZP/htmlpage.html";
String url3 = "www.examplesite.com/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html";
String patternStr = "(?:http://)?[^/]*[/]?([\\S]*)/[\\d]{4}/[\\d]{2}/[\\d]{2}[/]?([\\S]*)/[\\S]*/[\\S]*";
// Compile regular expression
Pattern pattern = Pattern.compile(patternStr);
// Match 1st url
System.out.println("Match 1st URL:");
Matcher matcher = pattern.matcher(url);
if (matcher.find()) {
System.out.println("URL: " + matcher.group(0));
System.out.println("DIR: " + matcher.group(1));
System.out.println("TITLE: " + matcher.group(2));
}
else{ System.out.println("No match."); }
// Match 2nd url
System.out.println("\nMatch 2nd URL:");
matcher = pattern.matcher(url2);
if (matcher.find()) {
System.out.println("URL: " + matcher.group(0));
System.out.println("DIR: " + matcher.group(1));
System.out.println("TITLE: " + matcher.group(2));
}
else{ System.out.println("No match."); }
// Match 3rd url
System.out.println("\nMatch 3rd URL:");
matcher = pattern.matcher(url3);
if (matcher.find()) {
System.out.println("URL: " + matcher.group(0));
System.out.println("DIR: " + matcher.group(1));
System.out.println("TITLE: " + matcher.group(2));
}
else{ System.out.println("No match."); }
}
}
Output: 输出:
Match 1st URL:
URL: http://www.examplesite.com/dir/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html
DIR: dir
TITLE: title-of-some-story
Match 2nd URL:
URL: www.examplesite.com/dir/dir2/dir3/2012/06/19/FAQKZjC3veXSalP9zxFgZP/htmlpage.html
DIR: dir/dir2/dir3
TITLE:
Match 3rd URL:
URL: www.examplesite.com/2012/06/19/title-of-some-story/FAQKZjC3veXSalP9zxFgZP/htmlpage.html
DIR:
TITLE: title-of-some-story
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