According to the tutorial I'm following:
{n} matches exactly n of the previous thing
Thus I expect:
"fo" =~ /o{2}/ = false
"foo" =~ /o{2}/ = true
"fooo" =~ /o{2}/ = false
Instead I get:
"fo" =~ /o{2}/ = false
"foo" =~ /o{2}/ = true
"fooo" =~ /o{2}/ = true
I have similar issues with {x,y}. I expect:
"fa" =~ /a{2,4}/ = false
"faa" =~ /a{2,4}/ = true
"faaa" =~ /a{2,4}/ = true
"faaaa" =~ /a{2,4}/ = true
"faaaaa" =~ /a{2,4}/ = false
Instead I get:
"fa" =~ /a{2,4}/ = false
"faa" =~ /a{2,4}/ = true
"faaa" =~ /a{2,4}/ = true
"faaaa" =~ /a{2,4}/ = true
"faaaaa" =~ /a{2,4}/ = true
What am I doing wrong, or misunderstanding?
Daniel Kurtz
Answer 1)
A regular expression need not match the entire string. It is sufficient if a
PART of the string matchesdthe reg-ex (unless specified otherwise).
/o{2}/ matches exactly "oo" in "fooo". The regex matching algorithm is
satisfied with this, and doesnt care about the other parts of the string.
Answr 2)
a{2,4} requires a minimum of two 'a's and a max of 4 'a's. The first case
should not be a problem. The second case is ALSO satisfied if we leave out
the last 'a'.
This makes much more sense if you try to match "faaaaa" and "faaaab" and
"faaab" afainst /a{2,4}b/
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