math_text_compare

The name says "math" but there's no arithmetic here at all - this node compares two pieces of text and outputs a single true/false, which is exactly what you need to drive a switch or gate node elsewhere in a graph. Something like "if my prompt contains the word 'night', route through this ControlNet branch instead of that one" is the kind of logic this exists for. It just landed in Apt_Preset's data category alongside the actually-numeric math_Remap_data, which is a slightly odd shelf to put it on.

Part of ComfyUI-Apt_Preset. No models, no downloads, pure string comparison.

How it works

mode picks the comparison. The node's own documentation lays out nine of them: exact equality, inequality, "A contains B", "A does not contain B", a check for whether the text is empty (blank strings and pure whitespace both count as empty), three length comparisons (equal, less than, greater than), and a regex match. ignore_case gets applied first, before whichever comparison runs, so "Night" and "night" are treated the same by default unless you turn it off.

The regex mode is the flexible one and the one most likely to trip you up if you're not used to regex syntax. A bare pattern like black matches "black" anywhere in the string. Anchor it with ^black to require the match at the start, black$ to require it at the end, or ^black$ if you want the whole string to be exactly "black" and nothing else - that last one is the one people expect by default and don't get unless they add both anchors.

Inputs and outputs

• mode - which comparison to run. Default is exact equality.
• ignore_case - fold case before comparing. On by default.
• text_a - the primary string, multiline, required.
• text_b (optional) - the second string, needed for every mode except the "is empty" check and regex match.
• regex_pattern (optional) - only used when mode is set to the regex option; write your own anchors (^, $) for start/end/full matching.

The single output is bool - wire it straight into whatever conditional or switch node in your graph branches on a boolean, whether that's stock ComfyUI logic nodes or another Apt_Preset utility.

Installing it

Through ComfyUI Manager: search "ComfyUI-Apt_Preset", install, restart. Manually:

cd ComfyUI/custom_nodes
git clone https://github.com/cardenluo/ComfyUI-Apt_Preset.git

Restart ComfyUI. Windows users have install.bat in the repo for dependencies; Linux/Mac, install from the requirements file inside your ComfyUI venv the normal way. Nothing about this node needs an external file - it's string comparison, done in Python's standard library.

Common issues

Regex mode "matches" something you didn't expect. Remember an unanchored pattern matches anywhere in the string, not the whole thing. If you want a full match, write ^pattern$ yourself - the node doesn't add anchors for you, per its own description.

"Text is empty" comes back false for a string that looks empty. Check for invisible characters - the node treats pure whitespace as empty (per its own documentation), but if there's a stray non-whitespace character in there (a zero-width space from a copy-paste, for instance) it won't register as blank.

Case-sensitive comparison isn't working. Confirm ignore_case is actually off - it defaults to on, so "Prompt" and "prompt" will read as equal unless you explicitly flip it.

Length comparison gives a surprising result. These modes compare raw character count, including whitespace and punctuation - a trailing space or newline in one of the two strings is enough to make "equal length" strings compare as unequal.