negative substring
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@ -29,3 +29,12 @@ bytes:
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> substr("🤔🤷", 0, 1)
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🤔
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```
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The offset index may be negative, in which case it is relative to the end of
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the given string. The length may be -1, in which case the remainder of the
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string after the given offset will be returned.
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```
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> substr("hello world", -5, -1)
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world
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```
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