deal with a string in XSL

Hello everybody,

I have a string like this : "p1|p3|p19|p45|" that
I would like to parse in a XSL document (I don't
any extensions working).

Let's say that this string is in a variable $P,
how can I do something like this :

<xs:if test="substring($P,'p1')">
    ...................

which means if "p1" is in the variable $P do
something...

Any help would be really appreciated,

Jean


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