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Update graph_mermaid.py #31577

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ab6acae
Update graph_mermaid.py
chgjin Jun 12, 2025
800790b
Merge branch 'master' into patch-1
chgjin Jun 16, 2025
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3 changes: 2 additions & 1 deletion libs/core/langchain_core/runnables/graph_mermaid.py
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Original file line number Diff line number Diff line change
Expand Up @@ -239,7 +239,8 @@ def add_subgraph(edges: list[Edge], prefix: str) -> None:

def _escape_node_label(node_label: str) -> str:
"""Escapes the node label for Mermaid syntax."""
return re.sub(r"[^a-zA-Z-_0-9]", "_", node_label)
mermaid_special_chars = r"[\(\)\[\]\{\}<>\"'`;:&|,=#`~^%?@$/+\-\*!\.\\]"
return re.sub(mermaid_special_chars, "_", node_label)


def _generate_mermaid_graph_styles(node_colors: NodeStyles) -> str:
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