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Returns a portion, or substring, of a string.

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string

The string from which you want to obtain a subset.

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offset

The number of characters into the input string at which this node begins its operation.

The offset of the first character in the input string is 0.

If offset is beyond the end of the input string, this node returns an empty string.

Default: 0

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length

The number of characters you want to include in the substring.

If length is negative or 0, this node returns an empty string.

Default: The entire length of string minus offset.

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substring

The portion of string beginning at offset that is length characters long.