Creates spotter function
Patterns, matches to which the returned function should return
whether to treat the patterns as regular expressions
This is a convenience function that creates and returns a function which returns
TRUE when any of its arguments match one of the patterns given here.
re is TRUE,
arguments to this function are matched as regular expressions in the returned
function using the base R function
grepl with its default parameters.
These currently imply no PERL-style regexps,
case sensitivity, and character rather than byte-based matching.
re is FALSE any exact match is sufficient for the returned function
to return TRUE.
A spotter function
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