This one should be simple, but I'm just not getting it.

I need to create a pattern that match will match a comma delimited string, with no spaces around the commas. Trailing commas aren't allowed either.
This will be used in a form data validation method.


For example, I'd be looking at strings like the following:

1,2,3,4          is a match
1, 2, 3 , 4      isn't a match
1,2,3,4,         isn't (trailing comma)

The tricky part is that I don't know in advance how many items will be in the string, so I need to match repeating sub-patterns.
I have the Friedl book and recall this being covered there but can't find it if it was.


Any ideas?

-- Brad Perkins

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