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Nagarajan Lakshmanan
IP Address validation
1 Answer(s)      3 years and 10 months ago
Posted in : Java Beginners


hi,I m now working with my final yr project,nd stuck in th middle i don't know how to validate the IP address in a JText field...(ie) the user shld enter the IP address in JTxt and when he hit the 'Submit' button the actionlistener shld check its valid or not...like if user have entered 256.324.156.120 it shld display 'Enter a valid IP'...


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June 16, 2011 at 7:41 PM


static private final String IPADDRESS_PATTERN = "^([01]?\d\d?|2[0-4]\d|25[0-5])\." + "([01]?\d\d?|2[0-4]\d|25[0-5])\." + "([01]?\d\d?|2[0-4]\d|25[0-5])\." + "([01]?\d\d?|2[0-4]\d|25[0-5])$"; Pattern pattern = Pattern.compile(IPADDRESS_PATTERN);

String ip; Matcher matcher = pattern.matcher(ip);



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