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分享[100分]求一个能匹配所有url的正则表达式
求一个能匹配所有超链接的正则表达式.如题
需要能匹配所有url例如:
http://www.13.com
https://www.asdf.com.cn/asdf
www.23.com
http://www.123.com:2563/tsf（端口不能超过65535，端口不能出现在子域中，如：http://www.abc.com/ab:2525/a.asp,这个不能算是正确的url吧）
http://www.123.com:2563/tsf/a.html?a=2&&b=abc
http://www.aa.com/servlet
http://ee.com/abcSerlvet?a=8&&b=asdf
ftp://192.168.0.2:8080
http://ww.ss.com/////(这样是正确的可以访问)
等等，尽量写一个完美的正则表达式。
请求帮助
需要能匹配所有url例如:
http://www.13.com
https://www.asdf.com.cn/asdf
www.23.com
http://www.123.com:2563/tsf（端口不能超过65535，端口不能出现在子域中，如：http://www.abc.com/ab:2525/a.asp,这个不能算是正确的url吧）
http://www.123.com:2563/tsf/a.html?a=2&&b=abc
http://www.aa.com/servlet
http://ee.com/abcSerlvet?a=8&&b=asdf
ftp://192.168.0.2:8080
http://ww.ss.com/////(这样是正确的可以访问)
等等，尽量写一个完美的正则表达式。
请求帮助
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心所向皆可成 2012-07-15
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唉，娘希匹
yx1097111 2010-07-19
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学习了。谢谢各位大大
yellowpeter 2009-11-19
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MARK
johnsoncr 2008-09-12
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用一个正则式应该是不可能完成所有的检查
luxiaoxun 2008-09-12
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友情 up
heliangtai 2008-09-12
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再顶
heliangtai 2008-09-12
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我要用在类似QQ这样聊天里面，我要从一个文本里分析出所有URL，之后给它展现成一样超链接形式。这样正则表达式估计不太好弄，QQ上面的都不太完善。希望大家共同想个办法，完善这个URL的正则表达式。
rascalboy520 2008-09-12
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你是在什么里用，如果是在源码里找的话，url都会用<a href="" ..></a>这样的对子表示的，这样的话，
只要用
就可以了，
只要用
<a href=\"([^\"]+)\"[^>]*>[^<]+</a>
就可以了，
heliangtai 2008-09-12
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经过验证不能满足要求。比如:http::/asdfasd.com它也算是url了，还有:http://www.abc.com:2342304708209348/sadfasdfh.html也算，这样的能算是url了，端口都超过65535了，所以目前为止还没有能满足的
魔鬼代言人5800 2008-09-12
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找火龙果，他是高手
maodie007 2008-09-12
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org.apache.oro.text.perl.Perl5Util
包是Jakarta 的 oro 项目中的
包是Jakarta 的 oro 项目中的
maodie007 2008-09-12
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再接上面
/**
* Returns true if the path is valid. A <code>null</code> value is considered invalid.
* @param path Path value to validate.
* @return true if path is valid.
*/
protected boolean isValidPath(String path) {
if (path == null) {
return false;
}
Perl5Util pathMatcher = new Perl5Util();
if (!pathMatcher.match(PATH_PATTERN, path)) {
return false;
}
int slash2Count = countToken("//", path);
if (this.options.isOff(ALLOW_2_SLASHES) && (slash2Count > 0)) {
return false;
}
int slashCount = countToken("/", path);
int dot2Count = countToken("..", path);
if (dot2Count > 0) {
if ((slashCount - slash2Count - 1) <= dot2Count) {
return false;
}
}
return true;
}
/**
* Returns true if the query is null or it's a properly formatted query string.
* @param query Query value to validate.
* @return true if query is valid.
*/
protected boolean isValidQuery(String query) {
if (query == null) {
return true;
}
Perl5Util queryMatcher = new Perl5Util();
return queryMatcher.match(QUERY_PATTERN, query);
}
/**
* Returns true if the given fragment is null or fragments are allowed.
* @param fragment Fragment value to validate.
* @return true if fragment is valid.
*/
protected boolean isValidFragment(String fragment) {
if (fragment == null) {
return true;
}
return this.options.isOff(NO_FRAGMENTS);
}
/**
* Returns the number of times the token appears in the target.
* @param token Token value to be counted.
* @param target Target value to count tokens in.
* @return the number of tokens.
*/
protected int countToken(String token, String target) {
int tokenIndex = 0;
int count = 0;
while (tokenIndex != -1) {
tokenIndex = target.indexOf(token, tokenIndex);
if (tokenIndex > -1) {
tokenIndex++;
count++;
}
}
return count;
}
}
maodie007 2008-09-12
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接着上
/**
* <p>Checks if a field has a valid url address.</p>
*
* @param value The value validation is being performed on. A <code>null</code>
* value is considered invalid.
* @return true if the url is valid.
*/
public boolean isValid(String value) {
if (value == null) {
return false;
}
Perl5Util matchUrlPat = new Perl5Util();
Perl5Util matchAsciiPat = new Perl5Util();
if (!matchAsciiPat.match(LEGAL_ASCII_PATTERN, value)) {
return false;
}
// Check the whole url address structure
if (!matchUrlPat.match(URL_PATTERN, value)) {
return false;
}
if (!isValidScheme(matchUrlPat.group(PARSE_URL_SCHEME))) {
return false;
}
if (!isValidAuthority(matchUrlPat.group(PARSE_URL_AUTHORITY))) {
return false;
}
if (!isValidPath(matchUrlPat.group(PARSE_URL_PATH))) {
return false;
}
if (!isValidQuery(matchUrlPat.group(PARSE_URL_QUERY))) {
return false;
}
if (!isValidFragment(matchUrlPat.group(PARSE_URL_FRAGMENT))) {
return false;
}
return true;
}
/**
* Validate scheme. If schemes[] was initialized to a non null,
* then only those scheme's are allowed. Note this is slightly different
* than for the constructor.
* @param scheme The scheme to validate. A <code>null</code> value is considered
* invalid.
* @return true if valid.
*/
protected boolean isValidScheme(String scheme) {
if (scheme == null) {
return false;
}
Perl5Util schemeMatcher = new Perl5Util();
if (!schemeMatcher.match(SCHEME_PATTERN, scheme)) {
return false;
}
if (this.options.isOff(ALLOW_ALL_SCHEMES)) {
if (!this.allowedSchemes.contains(scheme)) {
return false;
}
}
return true;
}
/**
* Returns true if the authority is properly formatted. An authority is the combination
* of hostname and port. A <code>null</code> authority value is considered invalid.
* @param authority Authority value to validate.
* @return true if authority (hostname and port) is valid.
*/
protected boolean isValidAuthority(String authority) {
if (authority == null) {
return false;
}
Perl5Util authorityMatcher = new Perl5Util();
Perl5Util matchIPV4Pat = new Perl5Util();
if (!authorityMatcher.match(AUTHORITY_PATTERN, authority)) {
return false;
}
boolean ipV4Address = false;
boolean hostname = false;
// check if authority is IP address or hostname
String hostIP = authorityMatcher.group(PARSE_AUTHORITY_HOST_IP);
ipV4Address = matchIPV4Pat.match(IP_V4_DOMAIN_PATTERN, hostIP);
if (ipV4Address) {
// this is an IP address so check components
for (int i = 1; i <= 4; i++) {
String ipSegment = matchIPV4Pat.group(i);
if (ipSegment == null || ipSegment.length() <= 0) {
return false;
}
try {
if (Integer.parseInt(ipSegment) > 255) {
return false;
}
} catch(NumberFormatException e) {
return false;
}
}
} else {
// Domain is hostname name
Perl5Util domainMatcher = new Perl5Util();
hostname = domainMatcher.match(DOMAIN_PATTERN, hostIP);
}
//rightmost hostname will never start with a digit.
if (hostname) {
// LOW-TECH FIX FOR VALIDATOR-202
// TODO: Rewrite to use ArrayList and .add semantics: see VALIDATOR-203
char[] chars = hostIP.toCharArray();
int size = 1;
for(int i=0; i<chars.length; i++) {
if(chars[i] == '.') {
size++;
}
}
String[] domainSegment = new String[size];
boolean match = true;
int segmentCount = 0;
int segmentLength = 0;
Perl5Util atomMatcher = new Perl5Util();
while (match) {
match = atomMatcher.match(ATOM_PATTERN, hostIP);
if (match) {
domainSegment[segmentCount] = atomMatcher.group(1);
segmentLength = domainSegment[segmentCount].length() + 1;
hostIP =
(segmentLength >= hostIP.length())
? ""
: hostIP.substring(segmentLength);
segmentCount++;
}
}
String topLevel = domainSegment[segmentCount - 1];
if (topLevel.length() < 2 || topLevel.length() > 4) {
return false;
}
// First letter of top level must be a alpha
Perl5Util alphaMatcher = new Perl5Util();
if (!alphaMatcher.match(ALPHA_PATTERN, topLevel.substring(0, 1))) {
return false;
}
// Make sure there's a host name preceding the authority.
if (segmentCount < 2) {
return false;
}
}
if (!hostname && !ipV4Address) {
return false;
}
String port = authorityMatcher.group(PARSE_AUTHORITY_PORT);
if (port != null) {
Perl5Util portMatcher = new Perl5Util();
if (!portMatcher.match(PORT_PATTERN, port)) {
return false;
}
}
String extra = authorityMatcher.group(PARSE_AUTHORITY_EXTRA);
if (!GenericValidator.isBlankOrNull(extra)) {
return false;
}
return true;
}maodie007 2008-09-12
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其实apache的validator包已经给了URL验证了我把这个类的代码贴下 借鉴下吧
import java.io.Serializable;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import org.apache.commons.validator.util.Flags;
import org.apache.oro.text.perl.Perl5Util;
/**
* <p>Validates URLs.</p>
* Behavour of validation is modified by passing in options:
* <li>ALLOW_2_SLASHES - [FALSE] Allows double '/' characters in the path
* component.</li>
* <li>NO_FRAGMENT- [FALSE] By default fragments are allowed, if this option is
* included then fragments are flagged as illegal.</li>
* <li>ALLOW_ALL_SCHEMES - [FALSE] By default only http, https, and ftp are
* considered valid schemes. Enabling this option will let any scheme pass validation.</li>
*
* <p>Originally based in on php script by Debbie Dyer, validation.php v1.2b, Date: 03/07/02,
* http://javascript.internet.com. However, this validation now bears little resemblance
* to the php original.</p>
* <pre>
* Example of usage:
* Construct a UrlValidator with valid schemes of "http", and "https".
*
* String[] schemes = {"http","https"}.
* UrlValidator urlValidator = new UrlValidator(schemes);
* if (urlValidator.isValid("ftp://foo.bar.com/")) {
* System.out.println("url is valid");
* } else {
* System.out.println("url is invalid");
* }
*
* prints "url is invalid"
* If instead the default constructor is used.
*
* UrlValidator urlValidator = new UrlValidator();
* if (urlValidator.isValid("ftp://foo.bar.com/")) {
* System.out.println("url is valid");
* } else {
* System.out.println("url is invalid");
* }
*
* prints out "url is valid"
* </pre>
*
* @see
* <a href='http://www.ietf.org/rfc/rfc2396.txt' >
* Uniform Resource Identifiers (URI): Generic Syntax
* </a>
*
* @version $Revision: 478334 $ $Date: 2006-11-22 21:31:54 +0000 (Wed, 22 Nov 2006) $
* @since Validator 1.1
*/
public class UrlValidator implements Serializable {
/**
* Allows all validly formatted schemes to pass validation instead of
* supplying a set of valid schemes.
*/
public static final int ALLOW_ALL_SCHEMES = 1 << 0;
/**
* Allow two slashes in the path component of the URL.
*/
public static final int ALLOW_2_SLASHES = 1 << 1;
/**
* Enabling this options disallows any URL fragments.
*/
public static final int NO_FRAGMENTS = 1 << 2;
private static final String ALPHA_CHARS = "a-zA-Z";
private static final String ALPHA_NUMERIC_CHARS = ALPHA_CHARS + "\\d";
private static final String SPECIAL_CHARS = ";/@&=,.?:+$";
private static final String VALID_CHARS = "[^\\s" + SPECIAL_CHARS + "]";
private static final String SCHEME_CHARS = ALPHA_CHARS;
// Drop numeric, and "+-." for now
private static final String AUTHORITY_CHARS = ALPHA_NUMERIC_CHARS + "\\-\\.";
private static final String ATOM = VALID_CHARS + '+';
/**
* This expression derived/taken from the BNF for URI (RFC2396).
*/
private static final String URL_PATTERN =
"/^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?/";
// 12 3 4 5 6 7 8 9
/**
* Schema/Protocol (ie. http:, ftp:, file:, etc).
*/
private static final int PARSE_URL_SCHEME = 2;
/**
* Includes hostname/ip and port number.
*/
private static final int PARSE_URL_AUTHORITY = 4;
private static final int PARSE_URL_PATH = 5;
private static final int PARSE_URL_QUERY = 7;
private static final int PARSE_URL_FRAGMENT = 9;
/**
* Protocol (ie. http:, ftp:,https:).
*/
private static final String SCHEME_PATTERN = "/^[" + SCHEME_CHARS + "]/";
private static final String AUTHORITY_PATTERN =
"/^([" + AUTHORITY_CHARS + "]*)(:\\d*)?(.*)?/";
// 1 2 3 4
private static final int PARSE_AUTHORITY_HOST_IP = 1;
private static final int PARSE_AUTHORITY_PORT = 2;
/**
* Should always be empty.
*/
private static final int PARSE_AUTHORITY_EXTRA = 3;
private static final String PATH_PATTERN = "/^(/[-\\w:@&?=+,.!/~*'%$_;]*)?$/";
private static final String QUERY_PATTERN = "/^(.*)$/";
private static final String LEGAL_ASCII_PATTERN = "/^[\\000-\\177]+$/";
private static final String IP_V4_DOMAIN_PATTERN =
"/^(\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})$/";
private static final String DOMAIN_PATTERN =
"/^" + ATOM + "(\\." + ATOM + ")*$/";
private static final String PORT_PATTERN = "/^:(\\d{1,5})$/";
private static final String ATOM_PATTERN = "/(" + ATOM + ")/";
private static final String ALPHA_PATTERN = "/^[" + ALPHA_CHARS + "]/";
/**
* Holds the set of current validation options.
*/
private Flags options = null;
/**
* The set of schemes that are allowed to be in a URL.
*/
private Set allowedSchemes = new HashSet();
/**
* If no schemes are provided, default to this set.
*/
protected String[] defaultSchemes = {"http", "https", "ftp"};
/**
* Create a UrlValidator with default properties.
*/
public UrlValidator() {
this(null);
}
/**
* Behavior of validation is modified by passing in several strings options:
* @param schemes Pass in one or more url schemes to consider valid, passing in
* a null will default to "http,https,ftp" being valid.
* If a non-null schemes is specified then all valid schemes must
* be specified. Setting the ALLOW_ALL_SCHEMES option will
* ignore the contents of schemes.
*/
public UrlValidator(String[] schemes) {
this(schemes, 0);
}
/**
* Initialize a UrlValidator with the given validation options.
* @param options The options should be set using the public constants declared in
* this class. To set multiple options you simply add them together. For example,
* ALLOW_2_SLASHES + NO_FRAGMENTS enables both of those options.
*/
public UrlValidator(int options) {
this(null, options);
}
/**
* Behavour of validation is modified by passing in options:
* @param schemes The set of valid schemes.
* @param options The options should be set using the public constants declared in
* this class. To set multiple options you simply add them together. For example,
* ALLOW_2_SLASHES + NO_FRAGMENTS enables both of those options.
*/
public UrlValidator(String[] schemes, int options) {
this.options = new Flags(options);
if (this.options.isOn(ALLOW_ALL_SCHEMES)) {
return;
}
if (schemes == null) {
schemes = this.defaultSchemes;
}
this.allowedSchemes.addAll(Arrays.asList(schemes));
}heliangtai 2008-09-12
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经过验证还发现以下问题：
www.qq.com./,www.qq.com.，这样的是可以访问到腾讯主页的，因为最后面的“.”是根域名，是可以存在的，但在子域中可能不会出现。如
www.qq.com./sports./abc.html这样的是不合法的。看来要完美几乎不太可能了，争取今天结贴。
www.qq.com./,www.qq.com.，这样的是可以访问到腾讯主页的，因为最后面的“.”是根域名，是可以存在的，但在子域中可能不会出现。如
www.qq.com./sports./abc.html这样的是不合法的。看来要完美几乎不太可能了，争取今天结贴。
heliangtai 2008-09-12
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经验证好像还不完善：http://www.qq.com/test/a.htmla.html这个它当作是合法的URL，不过有这个基础再改造应该很容易了，谢谢。
heliangtai 2008-09-12
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终于来救星了，谢谢！正在验证....
火龙果被占用了 2008-09-12
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注释一下，上面的表达式中有一部分是直接引自 Mastering Regular Expressions 一书的。
火龙果被占用了 2008-09-12
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像这种复杂的表达式得采用分而治之原则，一块一块地写，如果不是这样的话，
写到后面都不知道自己在写什么了。
这样做的好处在于，如果哪一段不正确了，可以很快地进行定位并修正。
上面的表达式采用了内嵌的注释模式，用于书写调试期间使用，精简模式为（太长了，分成多行了）：
写到后面都不知道自己在写什么了。
这样做的好处在于，如果哪一段不正确了，可以很快地进行定位并修正。
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Test01 {
public static void main(String[] args) {
// 子域名
final String SUB_DOMAIN = "(?i:[a-z0-9]|[a-z0-9][-a-z0-9]*[a-z0-9])";
// 顶级域名
final String TOP_DOMAINS =
"(?x-i:com\\b \n" +
" |edu\\b \n" +
" |biz\\b \n" +
" |in(?:t|fo)\\b \n" +
" |mil\\b \n" +
" |net\\b \n" +
" |org\\b \n" +
" |[a-z][a-z]\\b \n" + // 国家代码
") \n";
// 主机名
final String HOSTNAME = "(?:" + SUB_DOMAIN + "\\.)+" + TOP_DOMAINS;
// URL 地址中不允许包括的字符，以及其他的条件
final String NOT_IN = ";:\"'<>()\\[\\]{}\\s\\x7F-\\xFF";
final String NOT_END = "!.,?";
final String ANYWHERE = "[^" + NOT_IN + NOT_END + "]";
final String EMBEDDED = "[" + NOT_END + "]";
final String URL_PATH = "/" + ANYWHERE + "*(" + EMBEDDED + "+" + ANYWHERE + "+)*";
// 端口号 0～65535
final String PORT =
"(?: \n" +
" [0-5]?[0-9]{1,4} \n" +
" | \n" +
" 6(?: \n" +
" [0-4][0-9]{3} \n" +
" | \n" +
" 5(?: \n" +
" [0-4][0-9]{2} \n" +
" | \n" +
" 5(?: \n" +
" [0-2][0-9] \n" +
" | \n" +
" 3[0-5] \n" +
" ) \n" +
" ) \n" +
" ) \n" +
")";
// URL 表达式
final String URL =
"(?x: \n"+
" \\b \n"+
" (?: \n"+
" (?: ftp | http s? ): // [-\\w]+(\\.\\w[-\\w]*)+ \n"+
" | \n"+
" " + HOSTNAME + " \n"+
" ) \n"+
" (?: : " + PORT + " )? \n"+
" (?: " + URL_PATH + ")? \n"+
")";
// 测试代码
String[] strs = {
"http://www.13.com",
"https://www.asdf.com.cn/asdf",
"www.23.com",
"http://www.123.com/tsf",
"http://www.abc.com/ab:2525/a.asp",
"http://www.123.com:2563/tsf/a.html?a=2&&b=abc",
"http://www.aa.com/servlet",
"http://ee.com/abcSerlvet?a=8&&b=asdf",
"ftp://192.168.0.2:8080",
"http://ww.ss.com/////"
};
Pattern pattern = Pattern.compile(URL);
Matcher matcher = pattern.matcher("");
for(int i = 0; i < strs.length; i++) {
System.out.printf("%s --> %s%n", strs[i], matcher.reset(strs[i]).matches());
}
}
}上面的表达式采用了内嵌的注释模式，用于书写调试期间使用，精简模式为（太长了，分成多行了）：
\b(?:(?:ftp|https?)://[-\w]+(\.\w[-\w]*)+|(?:(?i:[a-z0-9]|[a-z0-9][-a-z0-9]*[a-z0-9])\.)+
(?x-i:com\b|edu\b|biz\b|in(?:t|fo)\b|mil\b|net\b|org\b|[a-z][a-z]\b))
(?::(?:[0-5]?[0-9]{1,4}|6(?:[0-4][0-9]{3}|5(?:[0-4][0-9]{2}|5(?:[0-2][0-9]|3[0-5])))))?
(?:/[^;:"'<>()\[\]{}\s\x7F-\xFF!.,?]*([!.,?]+[^;:"'<>()\[\]{}\s\x7F-\xFF!.,?]+)*)?火龙果被占用了 2008-09-12
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22 楼说的网站可以去看看，那里可以说是正则表达式库了，不过是用 .net 写的。
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