Regular expressions
DunbarX at aol.com
DunbarX at aol.com
Thu Feb 5 16:18:51 EST 2009
In a message dated 2/5/09 4:08:48 PM, briany at qldlearning.com writes:
>
> Read it as "one 'Z' followed by zero or more 'A' followed by one 'B'".
> Thus the Z and B are required with any number of A in between
> (including zero). So it would match:
>
> ZB
> ZAB
> ZAAB
> ZAAAB
>
> And so on.
>
> In short, a single letter matches just that - a single letter. The *
> and + operators change the meaning to "zero or more" and "one or more"
> respectively. If you want the operator to apply to an entire
> expression, you need to group the expression in parentheses (or
> brackets, but that has another meaning).
>
> I think you may have a typo in your question, since both of your
> examples have the same expression - but hopefully that helps.
>
Thanks, I see it now, What threw me was the word "pattern" which made me
think of the "Z", the "A", or the "ZA". I see now it is only the single preceding
char (or pattern), and the "Z" is just there for reference.
And yes, I should have had a "+" in the second example.
Obvious.
Craig Newman
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