Regular expression to match 0 or 1

Question

I need a regexp to match either 0 or 1 entered into a field and no other characters at all, neither numeric nor alphas. How can I do it?

Accepted Answer

Single character, 0 or 1:

```
/^[01]$/
```

Multiple 0s or 1s (any order, no other characters):

```
/^[01]+$/g
```

Demo (Just add a `+` for the second example. The `gm` at the end in the demo is just for the example because there are multiple lines for test cases)

Solution