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# consuming(_:startingAt:in:)

Process the input string within the specified bounds, beginning at the given index, and return the end position (upper bound) of the match and the produced output.

```
func consuming(_ input: String, startingAt index: String.Index, in bounds: Range<String.Index>) throws -> (upperBound: String.Index, output: Value)?
```

## Parameters

`input`

An input string to match against.

`index`

The index within `input` at which to begin searching.

`bounds`

The bounds within `input` in which to search.

## Return Value

The upper bound where the match terminates and a matched instance, or `nil` if there isn’t a match.

## Discussion

---

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