Text Custom Extract - Structured Text Extraction

Node Purpose: Text Custom Extract extracts values for a target key from JSON-like text. It supports robust input cleaning, multiple parse fallbacks, enhanced key synonyms, optional precision matching, and label-based filtering.

Inputs

Name	Port	Type	Default	Range	Description
`json_data`	-	STRING	``	-	JSON or JSON-like text; code fences and leading/trailing non-JSON content are cleaned.
`key`	-	STRING	`zh`	-	Target key to extract (supports synonyms).
`precision_match`	-	COMBO	`disabled`	`disabled` / `enabled`	Exact-key matching when `enabled`; otherwise case-insensitive with synonyms.
`label_filter`	-	STRING	``	-	Optional comma-separated labels to filter items (supports Chinese/English).

Outputs

Name	Type	Description
`string`	STRING	Extracted value(s); lists of numbers are joined with commas; list items from arrays are joined by newlines.

Features

Input cleaning: removes code fences and trims to the first balanced JSON block.
Multi-strategy parsing: tries json.loads, falls back to ast.literal_eval, quote normalization, and regex key-value extraction.
Enhanced key synonyms: supports variations for bbox, label, confidence, x, y, width, height, zh, en.
Label filtering: optional filter on a label field for lists or objects.
Precision matching: exact-key when enabled; otherwise case-insensitive and synonym-aware.
Value formatting: numeric lists joined by commas; other lists stringified.
Core logic: cleaning; parsing; synonyms; lookup; format; filters; main execution.

Typical Usage

Simple extraction: set key=zh to extract Chinese text from objects or arrays.
Synonym use: set key=bbox to match bbox, box, bounding_box, etc.
Label filtering: set label_filter=person,cat to retain items whose labels contain person or cat.
Exact matching: set precision_match=enabled to require the exact provided key.

Notes & Tips

The node accepts JSON fenced by Markdown code blocks and trims extraneous text around JSON.
When input is an array of objects, matched values are joined with newlines in output.

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