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 Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4501 Forbes Boulevard Suite H Lanham, MD 20706 301-459-3366 x.5010 fax 301-429-5748 ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
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Associated Messages, from the most recent to the oldest:
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 Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4501 Forbes Boulevard Suite H Lanham, MD 20706 301-459-3366 x.5010 fax 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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