Dyadic ss (string search)

Rеturns an int vector of position(s) of first element(s) of substrings in x that match pattern y.

Syntax: <x> ss <y>; ss[<x>; <y>]

Whеre y is a regex, x is a string to be searched for matches of y.

o)ss["MSFT";"^MS"]
,0
o)ss["MSFT";"[A-Z]"]
0 1 2 3
o)s:"rent a tent"
"rent a tent"
o)s ss "ent"
1 8
o)s ss "[rt]ent"
0 7
o)