If you're uncomfortable with the character length limits on domain and tldnames, change them to taste.**/ hodsfords:i love your expression,and i've came out with a solutions which does not need to set the number of times for the can accept unlimited number of times, but @ least 1 time / .xxx$exp = "^[a-z0-9] [a-z0-9\? @[a-z0-9_-] (\.[a-z0-9_-] )*\.[a-z] $"; This example checks for a valid IP address or CIDR notation address range.(Thanks Walo for just the start I needed.)The reg exp is too long to post in the code.So, just to make sure that user entered the email address in the correct format, it’s necessary to include email validation code inside the validation codes.
breakup the username/alias (ereg) and domain (eregi) parts of the email "^[a-z A-Z0-9_\-] (:? It's handyto have the same regex working at both ends. Note the mask for the localpart matches any printable character *excluding the dot*. Bobocop's regex enforces that role while ensuring thelocal part does not start or end with a dot.
\.svg|\.wmf|\.zip|\.tar\.gz|\.tgz)$"That is the proper file check for a well formatted beginning and ending filename for those select files. Outside of the 7-bit ASCII and dot rules, the RFC says 'anything goes' in thelocal part. All we need to realise is that our endeavours are limited, and the nearestwe'll get to validating an email address is finding an MX record in DNS.
Contrary to most folks' expectation, a quoted @ character is permitted in thelocal part of an email address.
Search for the checkdnsrr function page on this site andread the comments for good info.
Validation codes will return an alert message, if it finds some empty fields in the form.
If an user miss out any field, than the form will display error message.
function input Alphabet(inputtext, alert Msg) // Function that checks whether input text includes alphabetic and numeric characters.
function text Alphanumeric(inputtext, alert Msg) // Function that checks whether the input characters are restricted according to defined by user.
[a-z] : It matches characters from lowercase ‘a’ to lowercase ‘z’. If by mistake, user skips entering any detail, soon the alert message appear on the form.
escaping - by -) [0-9] : It matches digital number from 0-9. That means, you could be very sure about the form, whether users have entered the details or not.