prevind

prevind(str, i)

Get the previous valid string index before i. Returns a value less than 1 at the beginning of the string.

Examples

In the Julia programming language, the function prevind(str, i) is used to get the previous valid string index before i. It returns a value less than 1 at the beginning of the string.

Here are some examples of how prevind can be used:

Find the previous valid index in a string:
```
julia> str = "Hello, World!";
julia> prevind(str, 8)
7
```
In this example, prevind is used to find the previous valid index before position 8 in the string str. It returns 7 since the character at index 7 is the previous valid index before 8.
Handle the case when i is at the beginning of the string:
```
julia> str = "Julia";
julia> prevind(str, 1)
0
```
When i is at the beginning of the string, prevind returns a value less than 1, which in this case is 0.
Find the previous valid index in a longer string:
```
julia> long_str = "This is a long string.";
julia> prevind(long_str, 15)
14
```
In this example, prevind is used to find the previous valid index before position 15 in the long_str string. It returns 14 as the previous valid index.

Common mistake example:

julia> str = "Hello, World!";
julia> prevind(str, 0)
ERROR: BoundsError: attempt to access String "Hello, World!" at index [0]

In this case, the index provided is out of bounds for the string. It's important to ensure that the index is within the valid range of the string before using prevind.

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prevind

Examples

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