Text Logic Switch (FeiMao-326)

ComfyUI is a dataflow graph, and dataflow graphs are famously bad at "if this, do that." Core ComfyUI has no native conditional - you end up stacking bypass nodes or accepting that every branch runs every time. This node is a text-based conditional: check some incoming text against a pattern, and output one string on a match, another on no match. Two strings out, and you've built a branch.

How it works

Inputs: text (what you're testing), pattern (what you're looking for), mode (how to compare), and on_true / on_false (the strings to output). The six modes:

• contains - pattern is a substring. The default, and the workhorse.
• not_contains - the inverse.
• regex - pattern is treated as a regex; re.search, so it matches anywhere.
• exactly - text equals pattern, whole string.
• starts_with / ends_with - prefix and suffix checks.

The output is one STRING named result: on_true when the check passes, on_false when it doesn't. That's the whole mechanism, and it's refreshingly free of hidden behavior - no partial matching, no case-folding unless your regex does it.

Where it fits

The author's example is the good one: check if an LLM's output contains "Error" and, if so, stop the workflow or route to a fallback model. That's a genuinely useful pattern now that LLM nodes are common - one wrong API call can poison the rest of the graph, and a text switch is the cheapest guard. You connect the General API Node's describe output here, set pattern to Error, on_true to something that halts, on_false to the actual text, and you've built a poor man's try/catch.

Other natural uses: gate a branch on whether a prompt contains a keyword, decide between two templates, validate that a parsed value came back non-empty. Because on_true and on_false are arbitrary strings (multiline), they can carry whole prompts, not just True/False - which is the difference between "a switch" and "a text router."

Two caveats worth knowing. First, it outputs a string, not a connection that physically disables a branch - whatever is downstream of the chosen string still runs, but with your chosen content. If you need to actually skip work, wire the on_false output into a bypass-style node instead. Second, regex mode swallows invalid patterns silently (returns false rather than erroring), so a typo just makes the branch never fire - worth checking if your branch "mysteriously" always goes false.

Inputs and outputs

• text (STRING, multiline) - the text to test.
• pattern (STRING) - what to look for.
• mode (enum) - contains / not_contains / regex / exactly / starts_with / ends_with.
• on_true / on_false (STRING, multiline) - the two outputs.
• result (STRING) - whichever branch matched.

Installing

It ships in the FeiMao-326 pack. ComfyUI Manager (search "Comfyui-General-API-Node") or:

cd ComfyUI/custom_nodes
git clone https://github.com/FeiMao-326/Comfyui-General-API-Node.git
cd Comfyui-General-API-Node
pip install -r requirements.txt

Restart ComfyUI, then Add Node → FeiMao-326 → Text Logic Switch. Light dependencies, no model downloads.