Need help with pattern

Hello,

I need help in doing a replace using [[processors.regex.fields]]:

My field name is “field1”

The value of field1 is as follows:

{
“usages”: [],
“errors”: []
}

If field1 is that exact value, I want to create a new field called field2, with value 200. So my code is as follows:

[[processors.regex]]
[[processors.regex.fields]]
key = “field1”
pattern = “#####”
replacement = “200”
result_key = “field2”

It is the pattern ##### that I cannot figure out. Would someone be able to help me? Thank you in advance for your time.

Sincerely,

Jack