# Treat the pattern as a POSIX extended regular expression (the default)
#
# If `false`, it is treated as a POSIX basic regular expression (BRE).
#
# The extended syntax supports `?`, `+` and `|`. Also, `\` causes the following
# character to be used as literal.
var extended = true is writable
lib/core/re.nit:145,2--151,32