URI 是 Web上可用的每种资源 - HTML文档、图像、视频片段、程序等 - 由一个通用资源标志符（Uniform Resource Identifier, 简称"URI"）进行定位.
对就分组:
- ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(?([^#]*))?(#(.*))?
- 12 3 4 5 6 7 8 9
例,代码如下:
正则表达式 (http|ftp|https)://[w-_]+(.[w-_]+)+([w-.,@?^=%&:/~+#]*[w-@?^=%&/~+#])?
匹配 http://regxlib.com/Default.aspx | http://electronics.cnet.com/electronics/0-6342366-8-8994967-1.html
不匹配 www.phpfensi.com
正则表达式 ^\{2}[w-]+\(([w-][w-s]*[w-]+[$$]?$)|([w-][$$]?$))
匹配 \serverservice | \servermy service | \serv_001service$
不匹配 \my serverservice | \server service | \server$service
正则表达式 ^(http|https|ftp)://([a-zA-Z0-9.-]+(:[a-zA-Z0-9.&%$-]+)*@)?((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|([a-zA-Z0-9-]+.)*[a-zA-Z0-9-]+.[a-zA-Z]{2,4})(:[0-9]+)?(/[^/][a-zA-Z0-9.,?'\/+&%$#=~_-@]*)*$
匹配 http://www.sysrage.net | https://64.81.85.161/site/file.php?cow=moo's |ftp://user:pass@host.com:123
不匹配 phpfensi.com
正则表达式 ^([a-zA-Z]:|\\[^/\:*?"<>|]+\[^/\:*?"<>|]+)(\[^/\:*?"<>|]+)+(.[^/\:*?"<>|]+)$
匹配 c:Test.txt | \serversharedTest.txt | \serversharedTest.t
不匹配 c:Test | \servershared | \serversharedTest.?
正则表达式 ^(http|https|ftp)://([a-zA-Z0-9.-]+(:[a-zA-Z0-9.&%$-]+)*@)*((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|localhost|([a-zA-Z0-9-]+.)*[a-zA-Z0-9-]+.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(:[0-9]+)*(/($|[a-zA-Z0-9.,?'\+&%$#=~_-]+))*$
匹配 http://site.com/dir/file.php?var=moo | https://localhost |ftp://user:pass@site.com:21/file/dir
不匹配 site.com | http://site.com/dir//
正则表达式 ^([a-zA-Z]:)(\[^\/:*?<>"|]*(?<![ ]))*(.[a-zA-Z]{2,6})$
匹配 C:di___rfi_sysle.txt | c:dirfilename.txt
不匹配 c:dirfile?name.txt
正则表达式 ^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?.)+[a-zA-Z]{2,6}$
匹配 regexlib.com | this.is.a.museum | 3com.com
不匹配 notadomain-.com | helloworld.c | .oops.org
正则表达式 ^(((ht|f)tp(s?))://)?(www.|[a-zA-Z].)[a-zA-Z0-9-.]+.(com|edu|gov|mil|net|org|biz|info|name|museum|us|ca|uk)(:[0-9]+)*(/($|[a-zA-Z0-9.,;?'\+&%$#=~_-]+))*$
匹配 www.blah.com:8103 | www.blah.com/blah.asp?sort=ASC |www.blah.com/blah.htm#blah
不匹配 www.state.ga | http://www.blah.ru
正则表达式 b(([w-]+://?|www[.])[^s()<>]+(?:([wd]+)|([^[:punct:]s]|/)))
匹配 http://foo.com/blah_blah | http://foo.com/blah_blah/ | (Something like http://foo.com/blah_blah) | http://foo.com/blah_blah_(wikipedia) | (Something like http://foo.com/blah_blah_(wikipedia)) | 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.example.com/wpstyle/?p=364. | http://?df.ws/123 | rdar://1234 | rdar:/1234 | http://userid:password@example.com:8080 |http://userid@example.com | http://userid@example.com:8080 |http://userid:password@example.com
不匹配 no_ws.example.com | no_proto_or_ws.com | /relative_resource.php
可以匹配任何网址,代码如下:
- <script type="text/javascript">
- function IsURL(urlString)
- {
- regExp = /^((https?|ftp|news):
- if (urlString.match(regExp))
- return "is a url";
- else
- return "not a url";
- }
- url = "";
- alert(IsURL(url));
- </script>
PHP 测试,代码如下:
- <?php
- $search = '~^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(?([^#]*))?(#(.*))?~i';
- $url = 'http://www.php.net/pub/ietf/uri/#Related';
- $url = trim($url);
- preg_match_all($search, $url ,$rr);
- printf("<p>输出URL数据为：</p><pre>%s</pre>n",var_export( $rr ,TRUE));
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- ?>
百度上看到另外一块简洁的代码:
- <?php
-
- preg_match("/^(http://)?([^/]+)/i", "http：//www.php.net/index.html", $matches);
- $host = $matches[2];
-
- preg_match("/[^./]+.[^./]+$/", $host, $matches);
- echo "domain name is: {$matches[0]}n";
- ?>
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