The "regex_replace" function's format string parameter can refer to at most 99 subexpressions.

[janderson@…]

The format string has the following syntax: (?ddexpression1:expression2), which limits the number of subexpressions that can be matched and replaced.

If a regular expression contains more than 99 subexpressions that need to be matched and replaced (if matched), then it cannot be currently handled with the boost::regex_replace function because the format string cannot refer to a subexpression with an index greater than 99.

Is this current limitation necessary? If so, why?

[John Maddock]

Are you able to provide a convincing use case for more than 99 sub-expressions?

Thanks, John.

[John Maddock]

Never mind, recent changes in Trunk have fixed this.