match():        +
split():        +
patsplit():     +
gsub():         +
sub():          +
gensub():       +
str~/rexp/:     +
__________________________

match():        -
split():        -
patsplit():     -
gsub():         -
sub():          -
gensub():       -
str~/rexp/:     -
__________________________

match():        +
split():        +
patsplit():     +
gsub():         +
sub():          +
gensub():       +
str~/rexp/:     +
__________________________