Beginner question: detecting specified character in string

From: Julia Briggs (julia4_me_at_yahoo.com)
Date: 02/25/05 

Date: 24 Feb 2005 21:38:33 -0800

Hello, trying to create logic tests against a string allowing someone
to enter a certain character once or twice into a form consecutively,
but not twice seperated between other characters....

so,

hello##there (ok)
hello#there (ok)
#hello#there (no)
##hello#there (no)
###hellothere (no)

How would I do this? I was looking at strstr and some others, but not
sure. I have many challenges like this ahead, so hopefully someone
building this will help my mind figure out other designs.

Thanks so much!

-Julie

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