RegexExtract - ComfyUI Built-in Node Documentation

Complete documentation for the RegexExtract node in ComfyUI. Learn its inputs, outputs, parameters and usage.

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The RegexExtract node searches for patterns in text using regular expressions. It can find the first match, all matches, specific groups from matches, or all groups across multiple matches. The node supports various regex flags for case sensitivity, multiline matching, and dotall behavior.

Inputs

Parameter	Data Type	Required	Range	Description
string	STRING	Yes	-	The input text to search for patterns
regex_pattern	STRING	Yes	-	The regular expression pattern to search for
mode	COMBO	Yes	”First Match" "All Matches" "First Group" "All Groups”	The extraction mode determines what parts of matches are returned
case_insensitive	BOOLEAN	No	-	Whether to ignore case when matching (default: True)
multiline	BOOLEAN	No	-	Whether to treat the string as multiple lines (default: False)
dotall	BOOLEAN	No	-	Whether the dot (.) matches newlines (default: False)
group_index	INT	No	0-100	The capture group index to extract when using group modes (default: 1)

Note: When using “First Group” or “All Groups” modes, the group_index parameter specifies which capture group to extract. Group 0 represents the entire match, while groups 1+ represent the numbered capture groups in your regex pattern.

Outputs

Output Name	Data Type	Description
output	STRING	The extracted text based on the selected mode and parameters