Boost C++ Libraries

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This is the documentation for a snapshot of the develop branch, built from commit 3776819705.
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Function template keep

boost::xpressive::keep — Create an independent sub-expression.

Synopsis

// In header: <boost/xpressive/regex_primitives.hpp>


template<typename Expr> unspecified keep(Expr const & expr);

Description

Turn off back-tracking for a sub-expression. Any branches or repeats within the sub-expression will match only one way, and no other alternatives are tried.

[Note] Note

keep(expr) is equivalent to the perl (?>...) extension.

Parameters:

expr

The sub-expression to modify.


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