regexpr problem

[array chip <arrayprofile@yahoo.com>]

Hi,

I encountered a problem using "regexpr". The code
works fine in R, but not in S-Plus:

when run in R, it shows what I wanted (and it make
sense as well):
> regexpr("(JA)?[0-9]+","JA87")
[1] 1
attr(,"match.length")
[1] 4

but if I try it in S-Plus:
> regexpr("(JA)?[0-9]+","JA87")
[1] -1
attr(, "match.length"):
[1] -1

Basically, I wanted to match a pattern where there
might be letters "JA" preceding some numbers. Is there
something wrong with my code, or this a bug is S-Plus?

Thanks




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