float findFirst(string inputString, string matchString)
First occurrence (position/index) of matchString in the inputString or -1 if it is not found.
This function returns the index of the first occurrence of the matchString in the inputString.
Note: Indices are 0 - based.
findFirst("rule your city with cityengine","city") # result = 10 # "rule your " = 10 characters; then the match string starts
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