Regex to check input is not empty plus it's alphanumeric?

Question

I need a single regex to check if input must not be empty plus the input has alphanumeric characters only. I know the alphanumeric part,`^[\s+0-9a-zA-Z]+$`, but I am not sure about the not empty requirement. I can only use a single expression and I can't use any language function.

Accepted Answer

Simply use this regex to match a non-empty alphanumeric string:

```
^[a-zA-Z0-9]+$
```

Details

- `^` - string start

- `[a-zA-Z0-9]+` - one or more letters or digits

- `$` - string end.

Regex to check input is not empty plus it's alphanumeric?

Solution

Problem