Question

求一个能验证端口号的正则表达式，要求能在eclipse中使用。

Answer 1

public static int getPort(String url) {
String re="(([a-z][a-z0-9]*)://)?([^@:]+:[^@]*@)?([^\\s\\?\\.:&]+(\\.[^\\s\\?\\.:&]+)*)(:(\\d+))?(/.*)?";
Matcher matcher = Pattern.compile(re, Pattern.CASE_INSENSITIVE).matcher(url);
String protocol = matcher.group(2);
String port = matcher.group(7);
if (port == null) {
if (protocol == null || "http".equalsIgnoreCase(protocol))
port = "80";
else if ("ftp".equalsIgnoreCase(protocol))
port = "21";
}
return port == null ? -1 : Integer.parseInt(port);
}

Answer 2

/^(\d{1,4}|([1-5]\d{4})|([1-6][1-4]\d{3})|([1-6][1-4][1-4]{2})|([1-6][1-4][1-4][1-2]\d)|([1-6][1-5][1-5][1-3][1-5]))$/
经过了验证