String Essentials - Custom nodes for ComfyUI

Simple string manipulation nodes for ComfyUI (strip/remove text strings, search and replace text strings, preview modified string outputs). Useful for modifying text from LLM outputs (Ollama, Claude.ai, OpenAI ChatGPT), such as prompts or image-to-text description results. No additional Python dependencies or external modules required. Nodes use a small amount of basic Python and Javascript code.

Nodes included:

• String Textbox
• String Strip
• String Multi Replace
• String Conditional Append
• String Preview

Once added nodes can be found under the Add Node > utils > StringEssentials menu.

Features

• Remove or replace text, words, numbers in input strings
• Conditionally append text only when not already present
• Handle multi-word strings (partial sentences/phrases)
• Case-sensitive/insensitive matching
• Whole string matching option
• Preserve punctuation in prompts and special syntax (parentheses, colons, brackets)

String Textbox

A simple multiline textbox for free form text.

String Strip

Removes specified strings from input text. Each line should contain the string to be searched. The string can contain multiple words. To strip multiple individual words/strings place on separate lines.

Inputs

• input_string: The string or text to process
• strings_to_remove: List of strings to remove (one per line)
• match_case: Enable/disable case-sensitive matching
• match_whole_string: Ensure only exact matches are removed
• preserve_punctuation: Keep punctuation marks adjacent to matched text (default: enabled)
• remove_extra_spaces: Clean up extra spaces after removal

String Multi Replace

Replaces text strings with new strings (replace/swap words etc.). Each line should contain a search and replace pair separated by the replacement_delimiter (default is double colon ::). Example to replace dog with cat dog::cat. Supports mulitple string replacements, just add one replacement per line. You can also remove strings with this node just leave the right side of the delimiter blank.

Inputs

• input_string: The string or text to process
• replacement_pairs: List of search::replace pairs (one per line)
• replacement_delimiter: Character(s) that separate search and replace strings (default: ::)
• match_case: Enable/disable case-sensitive matching
• match_whole_string: Ensure only exact matches are replaced
• preserve_punctuation: Keep punctuation marks adjacent to matched text (default: enabled)
• remove_extra_spaces: Clean up extra spaces after replacement

String Conditional Append

Conditionally adds strings to the input text only if they're not already present. Useful for ensuring specific keywords or phrases exist in prompts without creating duplicates. Enter multiple strings (one per line) to check and append any that are missing.

Inputs

• input_string: The string or text to process (connection input)
• strings_to_check: List of strings to search for and append if not found (one per line)
• position: Where to add strings if not found (end or beginning)
• match_case: Enable/disable case-sensitive search
• separator: Character(s) to use between text and appended strings (default: , )

Outputs

• output_string: The resulting text (with or without appended strings)
• was_appended: Boolean indicating whether any strings were added

String Preview

Simply displays a string output. Can be used to view the results/changes to the input_string by the String Strip or String Replace.

Example Usage

Installation

1. Navigate to the custom_nodes directory in your ComfyUI installation path.
2. Clone the repository:

git clone https://github.com/bradsec/ComfyUI_StringEssentials.git

3. Restart ComfyUI or refresh your nodes.
4. Select nodes from the Add Node > utils > StringEssentials menu.

Found these nodes useful? ⭐ Star the repo github.com/bradsec/ComfyUI_StringEssentials.