Sometimes underline char is duplicated

[EmilyGraceSeville7cf]

OS version: Linux Mint 20.2 Cinnamon
Bulky version: 1.7

Steps to reproduce:

1. Create to files with 1 and 2 names respectively.
2. Put (.*) and \1_ into Find and Replace fields respectively. (Replace mode is Name only)
3. Obtain 1__ and 2__ names respectively.

[MuenchenSued]

Seems to be the normal behavior of regular expressions.

You can usr (.+) or ^(.*) for the correct result.

[EmilyGraceSeville7cf]

But string replace --regex '(.*)' '$1_' 1 produces exactly one underscore instead of two. It uses PCRE2 flavor. 🤔

[fenilgmehta]

It is because of the way python's re library works.

>>> import re
>>> re.findall(r'(.*)', 'abcde')
['abcde', '']

The empty string in the result is causing the double underscore.
Using (.+) or ^(.*)$ instead of (.*) will fix the issue.

[EmilyGraceSeville7cf]

Thanks for the answer! But am not sure whether such behavior is intuitive.