matchfuns {registry} | R Documentation |
Functions used for lookups of search keys.
match_ignorecase(lookup, entry, ...) match_exact(lookup, entry, ...) match_partial(lookup, entry, ...) match_partial_ignorecase(lookup, entry, ...) match_regexp(lookup, entry, ...)
lookup |
Search value to look up (for some key field). |
entry |
Vector of key values where lookup is sought. |
... |
For match_ignorecase and match_exact :
currently not used. For match_partial and
match_partial_ignorecase : additional arguments passed to
pmatch . For match_regexp : additional
arguments passed to grep . |
These are matching functions to be specified for key fields, controlling how search values are looked up in the registry.
David Meyer David.Meyer@R-project.org
## use exact matching R <- registry(stop_if_missing = FALSE) R$set_field("Key", type = "character", is_key = TRUE, index_FUN = match_exact) R$set_field("Value", type = "numeric") R$set_entry("the key", 1) R[["the key"]] R[["the"]] ## use partial matching R <- registry() R$set_field("Key", type = "character", is_key = TRUE, index_FUN = match_partial) R$set_field("Value", type = "numeric") R$set_entry("the key", 1) R[["the"]] ## use regular expressions R <- registry() R$set_field("Key", type = "character", is_key = TRUE, index_FUN = match_regexp) R$set_field("Value", type = "numeric") R$set_entry("the key", 1) R$set_entry("key", 2) R[["k.*"]] R["k.*"]