*S()*   *xpt-substitute*
S({pattern},{replace},[{flag}])
	Substitute typed content with pattern and replace. Just like
	|substitute()|.

									 *C()*
C()
	Get function context, see |xpt-snippet-function-ctx|.

								   *E({expr})*
E({expr})
	Equals to |expand()|.

									 *N()*
N()
	Current edited item name. Valid only to |xpt-snippet-post-filter|.

									 *V()*
V()
	Current typed text. Valid only to |xpt-snippet-post-filter|.

								   *R({name})*
R({name})
	Reference to history item. Get value by name.

					       *S({expr},{pat},{sub},{flags})*
S({expr},{pat},{sub},{flags})
	Equals to |substitute()|.

									*SV()*
SV()
	Equals to S(V(),{pat},{sub},{flag}).

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