Ryan Dillinger wrote:
Hello All,
I was studying some pattern matching. And I ran into this piece of code.
Now I believe I understand it up until the the last part \1.
Can someone explain it for me please?
Match lowercase a through z, uppercase A through lc z
no more than three times, with white space zero or one times
then I'm stumped, what's the 1 for?
/([a-zA-z]{3})\s*\1/
Hi Ryan
What everybody else said, plus:
The {3} means /exactly/ three times, no more or less.
/[a-zA-Z]{0,3}/
would mean between 0 and three times.
/[a-zA-Z]{1,3}/
between 1 and 3 times. Et cetera.
Rob
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