On Thu, 23 Feb 2006 14:30:10 +0000, Steve Flynn
<[EMAIL PROTECTED]> wrote:
>
>Speaking as somene who is learning RegExp's as he goes along I think;
>
>FOO = "[EMAIL PROTECTED]@$]{1,8}?\."
>
>At this point I think I've covered the first qualifier... An ungodly
>mess if I ever saw one. Hope slips from my grasp as I realise I have
>no way to say "and that can be followed by more of the same but only
>as long as you don't roll over 44 characters and don't forget that you
>can end in a period"
>
>As a little background, I'm writing an XML schema which is describing
>an XML document which can contain MVS datasets in a few fields. I'm
>trying to valididate fields and coming to the conclusion it's
>exceptionally difficult for my limited experience.
>
I don't know anything about how RE's are used in XML schemas, but in Perl
a RE could be used like this:
while (<>) {
chomp;
if ($_ =~ '^[A-Z#$][A-Z0-9#$-]{0,7}([.][A-Z#$][A-Z0-9#$-]{0,7}){0,21}$'
&& length($_) <= 44) {
print "passed: $_\n";
} else {
print "failed: $_\n"; }
}
or in a shell script, egrep could use the same RE to check everything but
the length.
I left out checking for at-sign (@) because the list server might
interpret parts of the RE as an email address and alter them, but just add
an at-sign after each #$ in the RE.
To allow lower case letters, change all 4 "A-Z" to "a-zA-Z" in the RE. If
you don't want to accept the minus-sign, take out the minus signs in the
two places where they are immediately followed by a square bracket.
Bill Godfrey
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