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email validation strings
I've got a couple of strings I use to validate emails.
I have no idea what either of them do or what they mean! I found them, they work, so I use them! Could somebody let me know what these mean? My guess is that the longer string is better, simply because it tests more thoroughly, but I could be mistaken. String1 = ""^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"" String2 = "^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w{2,}$" Thanks! ~Joe Show quote
"jp2code" <poojo.com/mail> wrote: They are regular expressions. If you don't know what those are, look>I've got a couple of strings I use to validate emails. > >I have no idea what either of them do or what they mean! I found them, they >work, so I use them! > >Could somebody let me know what these mean? My guess is that the longer >string is better, simply because it tests more thoroughly, but I could be >mistaken. > >String1 = >""^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"" > >String2 = "^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w{2,}$" here: http://www.regular-expressions.info/quickstart.html The first looks for any combination of letters, digits, hyphens, and dots followed by @, followed by either an IP address surrounded by square brackets, or the more familiar domain name. So it would accept either a**@xyz.com or abc@[123.222.11.143], which are both legal email addresses. The second is simpler. "\w" is a "word" character (which I think is letters or digits), so it's at least one of these, followed by any combination of "word character", hyphen, plus sign, dot, ending with at least one "word character". Then @, then a domain name (less rigorously scanned then in the first RE. So the first one allows IP addresses behind the @ sign, which is legal but *very* rare. Both, IMHO, will catch 99% of malformed email addresses. Thanks Mr. Slattery!
I knew they were "regular expressions," but they were a lot more complicated looking that the standard [0-9] or [A-Z] that I've ever had to use in the past. Regards, ~Joe Show quote "Tim Slattery" wrote: > They are regular expressions. If you don't know what those are, look > here: http://www.regular-expressions.info/quickstart.html > > The first looks for any combination of letters, digits, hyphens, and > dots followed by @, followed by either an IP address surrounded by > square brackets, or the more familiar domain name. So it would accept > either a**@xyz.com or abc@[123.222.11.143], which are both legal email > addresses. > > The second is simpler. "\w" is a "word" character (which I think is > letters or digits), so it's at least one of these, followed by any > combination of "word character", hyphen, plus sign, dot, ending with > at least one "word character". Then @, then a domain name (less > rigorously scanned then in the first RE. > > So the first one allows IP addresses behind the @ sign, which is legal > but *very* rare. Both, IMHO, will catch 99% of malformed email > addresses. > > -- > Tim Slattery > MS MVP(DTS) > Slatter***@bls.gov > http://members.cox.net/slatteryt  |
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