Returns the index of the first occurrence of a value in a string list. If the value is not found then -1 is returned.
listFind(list, value)
listFind(list, value, delim)
If delim is not specified then the default value of ',' is used as the value separator in the string list
[r: listFind("This, is, a, test", "is")]Returns 1
[r: listFind("This: is: a: test", "a", ":")]Returns 2
[r: listFind("This, is, a, test", "not")]Returns -1