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APPENG-5614 : Escape regex metacharacters in Function Caller Finder #281

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Merged
RedTanny merged 2 commits into from
Jul 8, 2026
Merged

APPENG-5614 : Escape regex metacharacters in Function Caller Finder #281

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f11ad37
feat: Escape regex metacharacters in Function Caller Finder
RedTanny Jul 8, 2026
7bf1115
CodeReview escape param
RedTanny Jul 8, 2026
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11 changes: 7 additions & 4 deletions src/vuln_analysis/utils/function_name_extractor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,9 +25,12 @@

def traverse_all_parameters(function_ending_index_end, function_prefix_index_end, function_string):
current_idx = function_prefix_index_end
function_builder = function_string[:function_prefix_index_end]
# Escape the function name prefix so regex metacharacters (., [], +, etc.)
# in identifiers like "protojson.Unmarshal" or "[]byte" are treated as literals.
prefix_name = function_string[:function_prefix_index_end - 1]
function_builder = re.escape(prefix_name) + r"\("
if current_idx == function_ending_index_end:
function_builder += ")"
function_builder += r"\)"
while current_idx < function_ending_index_end:
end_of_arg_ind = function_string[current_idx:].find(",")
if end_of_arg_ind > -1:
Expand All @@ -37,7 +40,7 @@ def traverse_all_parameters(function_ending_index_end, function_prefix_index_end
else:
# last argument
value = handle_argument(function_string[current_idx:function_ending_index_end].strip())
function_builder += f"\\s?{value}\\s?)"
function_builder += f"\\s?{value}\\s?\\)"
current_idx = function_ending_index_end

return function_builder
Expand Down Expand Up @@ -69,7 +72,7 @@ def handle_argument(param: str) -> str:
:return: returns the right matcher.
"""
if (param.startswith("'") and param.endswith("'")) or (param.startswith('"') and param.endswith('"')):
return param
return re.escape(param)
elif param.__contains__("(") and param.__contains__(")"):
function_prefix_index_end = param.find("(") + 1
function_ending_index_end = param.rfind(")")
Expand Down