Ino String Slice

If you've ever wanted to pull "midjourney" out of "midjourney_0001.png" without a regex, Ino String Slice is your node. It extracts a substring by start and end index and returns it as a plain string. Python users will feel right at home; everyone else needs the one paragraph of context below.

The inputs are input_string, start, and end, both indexes being INTs from 0 up. Indexing is zero-based: the first character is position 0. input_string[0:3] gives you the first three characters. That's the entire mechanism - it's Python slicing with a couple of guard rails bolted on.

The gotcha that will catch you

end defaults to 0, and the node treats 0 as "to the end of the string." So with start=5, end=0, you get everything from position 5 onward. That's a deliberate convenience - "slice from here to the end" is the most common ask - but it's also exactly backwards from what you'd expect if you're used to other slice tools, where 0:0 means an empty string.

So: want the tail? Leave end at 0. Want a specific span? Set end to something > 0 and the output is input_string[start:end]. Want the first N characters? Set start=0 and end=N. The end input has a min of 0, so you can't express "negative index" here - if you're slicing from the end, flip to InoStringSplit or trim first. One light aside: yes, the authors could have named it "SliceToEndWhenZero"; they didn't, so this paragraph is your documentation.

What it's for

Stripping extensions ([: -4]-style operations), pulling IDs out of generated filenames, cutting a caption down to its first sentence. Feed the result into InoStringContains or a concat and you've got real text processing in the graph.

Installing Ino Nodes

Part of the Ino pack - install once, use it and its 125 siblings. ComfyUI Manager: search "ComfyUI Ino Nodes", install, restart. Terminal:

cd ComfyUI/custom_nodes
git clone https://github.com/nobandegani/ComfyUI-InoNodes.git
cd comfyui_ino_nodes
pip install -r requirements.txt

Needs inopyutils in ComfyUI's Python environment, V3-schema pack so keep ComfyUI current. Nothing else.

Where people get burned

Just the end=0 behavior. If a slice is coming back longer than you expected, you almost certainly left end at its default thinking it meant "zero characters." Set it explicitly and the mystery evaporates.