Java regex issue. How can I search for numbers but not letters?

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Java

Hello everyone.
After a week of searching the web and trying different approaches, i give up.
I am facing an issue with regEx in Java and i am wondering if i can find some help here.
I am trying to find this "< < < < 06 76 > > " pattern in a huge string that i have to search through.
What i know is that, between the last "<" and the first ">" there can only be numbers type characters and any amount of spaces between the last ">" and the first "<". Also, between each "<" or ">" can be from 1 to 5 spaces.
I was able to create part of a pattern to use for my search, but i cant move forward from there.


I am stuck trying to include the idea of "any numbers, not more than 4 digits, separated by 1 to 5 spaces".

Finally, i am able to "close" the pattern to be searched with
"\\s{0,4}>\\s{0,4}>\\s{0,4}"
Sorry for the long text. I am trying to be as detailed as possible.
Thanks so much!
Regards.

What I have tried:

Here is what i was able to create as a search pattern.

String tag_open = "<\\s{0,4}<\\s{0,4}<\\s{0,4}<\\s{0,4}";