Search and Replace Format String Syntax

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## 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, Perl and Boost-Extended.

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.