list or remove instruments by expiration date
show names of or remove instruments that expire on a given date
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expiration date that should correspond to the ‘expires’ field of an instrument
an optional regular expression. Only names matching ‘pattern’ are returned.
exact match of pattern?
what to remove
ls_by_expiry will find instruments that have a field named either
“expiry” or “expires” with a value that matches
ls_by_expiry gives a vector of names of instruments that
expire on the given expiry.
rm_by_expiry is called for its
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