add support for not splitting "contains" value

[zWolfrost]

I've encountered situations where I wanted to filter out images with a blacklist of words in the filename (e.g. "low res", "lr", "preview", as well as their capitalized version) and the filter gets verbose really quickly. The "contains" function would be perfect to avoid this, but as of now you are forced to split the "values" parameter, which makes it unusable for filenames and such, and only useful for tags.
This could be a possible enhancement, where if the third parameter "separator" is set to "None" then the value won't get split, extending the function purposes.

[mikf]

You can already avoid values being split into separate "tags" by providing it as a 1-element list or tuple instead of a plain string value:

contains((filename,), ("low res", "lr", "preview"))

Also, maybe using regular expressions like re.search(r'(?i)low res|lr|preview', filename) would be better than using contains(), which was initially added for tags only.

You can also define and add custom functions and symbols using the globals option and a separate .py file / Python module.

[zWolfrost]

Hi, I'm afraid if the filename is contained in a 1-element tuple then the contains method will only check if one of the elements is in that tuple, or in other words if one of the elements is exactly equal to the filename, which is not what I want.
Nevertheless, the other options you've given me should work fine. Thanks for the help.