Function template keep
boost::xpressive::keep — Create an independent sub-expression.
Synopsis
template<typename Xpr> unspecified keep(Xpr const & xpr);
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.
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Parameters: |
xpr |
The sub-expression to modify. |
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Notes: |
keep(xpr) is equivalent to the perl (?>...) extension. |
