strip_think_tags() — langchain Function Reference

Architecture documentation for the strip_think_tags() function in output_parsers.py from the langchain codebase.

Function python LangChainCore ApiManagement called by 2

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LangChainCore→ ApiManagement→ strip_think_tags() — langchain Function Reference

Dependency Diagram

graph TD
  b2204b0d_d186_cc64_ba3a_c35b30d16454["strip_think_tags()"]
  1be78f27_fe4d_35ef_90f6_0cba68eb107b["output_parsers.py"]
  b2204b0d_d186_cc64_ba3a_c35b30d16454 -->|defined in| 1be78f27_fe4d_35ef_90f6_0cba68eb107b
  226e3323_bb76_2676_e692_4e21f7ba7236["parse_result()"]
  226e3323_bb76_2676_e692_4e21f7ba7236 -->|calls| b2204b0d_d186_cc64_ba3a_c35b30d16454
  9a2ae530_422d_2fd8_fa7d_2515e0623c7c["parse_result()"]
  9a2ae530_422d_2fd8_fa7d_2515e0623c7c -->|calls| b2204b0d_d186_cc64_ba3a_c35b30d16454
  style b2204b0d_d186_cc64_ba3a_c35b30d16454 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/partners/perplexity/langchain_perplexity/output_parsers.py lines 9–35

def strip_think_tags(text: str) -> str:
    """Removes all <think>...</think> tags and their content from text.

    This function removes all occurrences of think tags, preserving text
    before, between, and after the tags. It also handles markdown code fences.

    Args:
        text: The input text that may contain think tags.

    Returns:
        The text with all `<think>...</think>` blocks removed.
    """
    # Remove all <think>...</think> blocks using regex
    # The pattern matches <think> followed by any content (non-greedy) until </think>
    result = re.sub(r"<think>.*?</think>", "", text, flags=re.DOTALL)

    # Remove markdown code fence markers if present
    result = result.strip()
    if result.startswith("```json"):
        result = result[len("```json") :].strip()
    elif result.startswith("```"):
        result = result[3:].strip()

    if result.endswith("```"):
        result = result[:-3].strip()

    return result