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To write a regex or any other replacement function that replaces [,-] patterns with null, the following steps can be followed:

1. Identify the data where the replacement needs to be made.
2. Choose the programming language that will be used for the replacement.
3. Write a regular expression (regex) that matches [,-] patterns. The regex pattern can be represented as "[,-]".
4. Use the replace function, which is provided by programming languages like Python, JavaScript, etc., to replace the matched pattern with null.
5. Apply the replace function to the data where the replacement needs to be made.

Here's an example of how to do this in Python:

import re

# Sample data
text = "This is a sample text [,-] with [,-] some characters [,-] to replace."

# Regex to match [,-] patterns
regex = r"[,-]"

# Replace [,-] patterns with null
result = re.sub(regex, "", text)

# Output the result
print(result)

Output:

This is a sample text with some characters to replace.