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Posted by Leonard Burton on 11/16/05 07:25
HI Curt,
> > W1W
> > W1AW
> > WA1W
> > AD4HZ
> > N9URK
> > WB6NOA
> > 4N1UBG
> Ok, so i can conclude so far we have alpha numeric chars minimum of
> 3 chars up to 6, this would make a regex:
> /[A-Z0-9]{3,6}/
The only problem with this is that it would take "444" which is not a
valid call.
> > $pattern = "/^";
> > $pattern .= "([0-9][A-Z][0-9][A-Z]{3})|"; //4N1UBG
> > $pattern .= "([A-Z][0-9][A-Z]{1,3})|"; //N9URK, W1AW, W1W
> > $pattern .= "([A-Z]{2}[0-9][A-Z]{1,3})"; //WB6NOA, AD4HZ, WA1W
> > $pattern .= "/";
> >
> > I am still trying to master regexes. Is there a better way to do this?
>
> For one trying to master regex's you seem to have a good grasp on
> it.
Thanks for the support. I think I can do regex's pretty well but I do
not have a mastery of them yet.
> If this pattern works according to the specs of a callsign, it
> should work fine. You could try to combine the regex into one
> statment (without the | condition) but that would make the regex
> rather ugly.
I am looking for a regex that I can use for both preg_split and
preg_match. I have not yet really learned how to do preg_splits yet.
I am still trying to figure out what in the world to do. I have done
some preg_splits and I know enought to know that if you have more than
one set of () that will return on an expression then it will royally
mess things up.
> One thing i would suggest, although probably a minor issue
> considering how long the string is, is to make sure you put the
> most likely match in your first pattern to match.
Actually that is a good suggestion. I can see how it would make
things more efficent. Should you order the whole expression in terms
of how likely it is to get a result?
(i.e. "/^(most)|(frequent)|(least)/")
Thanks for the help!
--
Leonard Burton, N9URK
leonardburton@gmail.com
"The prolonged evacuation would have dramatically affected the
survivability of the occupants."
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