Hi Craig,
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.
OK, got the list of these, and I understand all of them but two:
1- The asterisk matches zero or more occurrences of the preceding
character
or pattern...
So why does "ZA*B" match "ZB", but does not match "AB""
And the "+" matches one or more occurrences of the preceding
character or
pattern
So why does "ZA*B" match "AB", but does not match "ZB"?
I know it will be obvious in about 20 minutes, when I get the first
repsonses.
Powerful tools, though.
Craig Newma
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