How to remove part of file name using a regex expression?

@lottie 

To remove a specific part of a file name using a regex expression, you can use a regex replace function in your programming language or text editor.

For example, if you want to remove the characters "123" from a file name, you can use the following regex replace function:

Regex: /123/g

Replacement: ""

This regex expression will match all occurrences of "123" in the file name and replace them with an empty string, effectively removing them from the file name.

Here is an example in Python:

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import re

file_name = "example123_file.txt"
new_file_name = re.sub(r'123', '', file_name)

print(new_file_name)

Output:

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example_file.txt

You can adjust the regex pattern and replacement string according to your specific requirements to remove the desired part from the file name.