Boost Regex fails to compile a regular expression such as "{abc}" with the error

"Invalid content of repeat range".  However, both Perl and PCRE accept the regular

expression, treating the "{" as a literal character.

The PCRE man page at http://www.pcre.org/pcre.txt clearly states:

    An opening curly bracket that appears in a position where a quantifier

    is not allowed, or one that does not match the syntax of a quantifier,

    is taken as a literal character.

The Perl regular expression man page at http://perldoc.perl.org/perlre.html

is similar, though not quite as clear:

    If a curly bracket occurs in any other context, it is treated as a regular

    character. In particular, the lower bound is not optional.

Nevertheless, the behaviour of both PCRE and Perl are the same.

I am currently using Boost 1.39, but I have seen no mention of a change in

this area for more recent versions of Boost Regex.

And finally … my question …

Is there a way in Boost Regex to interpret a "{" as a literal character in

the above context in a Perl regular expression, while still allowing the

"{n,m}" bounded repeat in places where it is syntactically valid?

Thanks.