I know I can use grep to find a word in all the files present in a folder like this

```
grep -rn core .

```

But my current directory has many sub-directories and I just want to **search in all xml files present in the current directory and its all sub directories**. How can I do that ?

I tried this

```
grep -rn core *.xml // Does not work

```

But it searches for xml files present in the current directory only. It does not do it recursively.