[section:format Search and Replace Format String Syntax]

Format strings are used by the algorithm [regex_replace] and by 
[match_results_format], and are used to transform one string into another.

There are three kind of format string: [sed_format], [perl_format] and [boost_extended_format].

Alternatively, when the flag `format_literal` is passed to one of these functions, 
then the format string is treated as a string literal, and is copied unchanged 
to the output.

[include format_sed_syntax.qbk]
[include format_perl_syntax.qbk]
[include format_boost_syntax.qbk]

[endsect]