[boost] regex format conditional expression question

From: Helck, Christopher (chelck_at_[hidden])
Date: 2003-06-03 15:24:52

How do I use the conditional expression in a format string when my
true_expression is a number? For example the format "(?1foo)" will replace
the 1st subexpression with the string "foo", but how do I replace the 1st
subexpression with 123? I try "(?1123)" and that fails. I can do "(?1 123)",
but it gives me an extra space. Ideas?

thanks
-chris

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