I've got `Hashmap`:

```
Map<Integer, String> map = new HashMap<>();

```

values in map:

```
{1=Thi1s, 2=is2, 3=3a, 4=T4est}

```

I need to remove digits from values like:

```
{1=This, 2=is, 3=a, 4=Test}

```

something like:

```
firstname1 = firstname1.replaceAll("\\d","");

```

but for `HashMap.`

How can I achieve it?