Re: [OT] Regular Expressions

This WebDNA talk-list message is from

2003

It keeps the original formatting. numero = 49877
interpreted = N
texte = Clint Davis wrote:> I'm trying to use a regular expression in a javascript to test an email> input field in a form like this:> > var goodEMAIL = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/> You will need to escape the period when it does not appear inside a set [] since it is otherwise a match any single character term. Try this instead:var goodEMAIL = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/> I thought this script was supposed to act as specified above, but I'm able> to enter something like a@aaaa with no problems, but a@a.a fails. The 2-4> character check at the end doesn't appear to be working. I'm sure one of the> veteran C programmers can answer this with no problem.> The reason that a@a.a fails is that the 2-4 check _is_ working; you cannot have fewer than two characters in your TLD (corresponding to the ISO country codes). However, I think the {2,4} should be changed to {2,} since there may now be domains longer than 4 characters (e.g. .museum). The reason that a@aaaa is working is that you are actually matching it like this: (a)@(aa)(aa)because you didn't escape the period.HTHJohn-- John PeacockDirector of Information Research and TechnologyRowman & Littlefield Publishing Group4501 Forbes BoulevardSuite HLanham, MD 20706301-459-3366 x.5010fax 301-429-5748-------------------------------------------------------------This message is sent to you because you are subscribed to the mailing list .To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/ Associated Messages, from the most recent to the oldest:

Re: [OT] Regular Expressions (Clint Davis 2003)
Re: [OT] Regular Expressions (John Peacock 2003)
[OT] Regular Expressions (Clint Davis 2003)

Clint Davis wrote:> I'm trying to use a regular expression in a javascript to test an email> input field in a form like this:> > var goodEMAIL = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/> You will need to escape the period when it does not appear inside a set [] since it is otherwise a match any single character term. Try this instead:var goodEMAIL = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/> I thought this script was supposed to act as specified above, but I'm able> to enter something like a@aaaa with no problems, but a@a.a fails. The 2-4> character check at the end doesn't appear to be working. I'm sure one of the> veteran C programmers can answer this with no problem.> The reason that a@a.a fails is that the 2-4 check _is_ working; you cannot have fewer than two characters in your TLD (corresponding to the ISO country codes). However, I think the {2,4} should be changed to {2,} since there may now be domains longer than 4 characters (e.g. .museum). The reason that a@aaaa is working is that you are actually matching it like this: (a)@(aa)(aa)because you didn't escape the period.HTHJohn-- John PeacockDirector of Information Research and TechnologyRowman & Littlefield Publishing Group4501 Forbes BoulevardSuite HLanham, MD 20706301-459-3366 x.5010fax 301-429-5748-------------------------------------------------------------This message is sent to you because you are subscribed to the mailing list .To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/ John Peacock

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Re: [OT] Regular Expressions

2003

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