We can use umber to "Matches the contents of the group of the same number" in Python. See Python re doc.
For example:
There are two strings:var abc=123; abc=234; and var abc=123; xyz=234;. I want to capture the first one but not the second.
We can use var\s+(\w+)\s*=\s*\d+\s*;\s*\1\s*=\s*\d+\s*; to do this in Python.
Now the question is how to do this in Golang?
Go does not support backrefernces (like \1). You can bypass that by using two-step match (first find a pattern and the check that it appears twice) or by changing regexp engine.
See also this question