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Programming-Idioms

# 341 Find substring last position
Set i to the position of the last occurrence of the string y inside the string x, if exists.

Specify if i should be regarded as a character index or as a byte index.

Explain the behavior when y is not contained in x.
New implementation

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To emphasize a name: _x → x

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Other implementations 
i = x.rfind(y)

i contains the character index or -1, if the substring is not found.

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