URL Validation

If you want to validate an URL in input fields, here is the JS code:

function isUrl(s) {
var regexp = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/
return regexp.test(s);
}

How to parse a URL?

If you want to parse a URL, here is the JS code: (please write a comment if you take this code)

function parseURL(buffer) {
var result = { };
result.protocol = "";
result.user = "";
result.password = "";
result.host = "";
result.port = "";
result.path = "";
result.query = "";
var section = "PROTOCOL";
var start = 0;
var wasSlash = false;
while(start < buffer.length) {
if(section == "PROTOCOL") {
if(buffer.charAt(start) == ':') {
section = "AFTER_PROTOCOL";
start++;
} else if(buffer.charAt(start) == '/' && result.protocol.length() == 0) {
section = PATH;
} else {
result.protocol += buffer.charAt(start++);
}
} else if(section == "AFTER_PROTOCOL") {
if(buffer.charAt(start) == '/') {
if(!wasSlash) {
wasSlash = true;
} else {
wasSlash = false;
section = "USER";
}
start ++;
} else {
throw new ParseException("Protocol shell be separated with 2 slashes");
}
} else if(section == "USER") {
if(buffer.charAt(start) == '/') {
result.host = result.user;
result.user = "";
section = "PATH";
} else if(buffer.charAt(start) == '?') {
result.host = result.user;
result.user = "";
section = "QUERY";
start++;
} else if(buffer.charAt(start) == ':') {
section = "PASSWORD";
start++;
} else if(buffer.charAt(start) == '@') {
section = "HOST";
start++;
} else {
result.user += buffer.charAt(start++);
}
} else if(section == "PASSWORD") {
if(buffer.charAt(start) == '/') {
result.host = result.user;
result.port = result.password;
result.user = "";
result.password = "";
section = "PATH";
} else if(buffer.charAt(start) == '?') {
result.host = result.user;
result.port = result.password;
result.user = "";
result.password = "";
section = "QUERY";
start ++;
} else if(buffer.charAt(start) == '@') {
section = "HOST";
start++;
} else {
result.password += buffer.charAt(start++);
}
} else if(section == "HOST") {
if(buffer.charAt(start) == '/') {
section = "PATH";
} else if(buffer.charAt(start) == ':') {
section = "PORT";
start++;
} else if(buffer.charAt(start) == '?') {
section = "QUERY";
start++;
} else {
result.host += buffer.charAt(start++);
}
} else if(section == "PORT") {
if(buffer.charAt(start) = '/') {
section = "PATH";
} else if(buffer.charAt(start) == '?') {
section = "QUERY";
start++;
} else {
result.port += buffer.charAt(start++);
}
} else if(section == "PATH") {
if(buffer.charAt(start) == '?') {
section = "QUERY";
start ++;
} else {
result.path += buffer.charAt(start++);
}
} else if(section == "QUERY") {
result.query += buffer.charAt(start++);
}
}
if(section == "PROTOCOL") {
result.host = result.protocol;
result.protocol = "http";
} else if(section == "AFTER_PROTOCOL") {
throw new ParseException("Invalid url");
} else if(section == "USER") {
result.host = result.user;
result.user = "";
} else if(section == "PASSWORD") {
result.host = result.user;
result.port = result.password;
result.user = "";
result.password = "";
}
return result;
}