import json

import re

def match_json_pattern(json_string, patterns):

"""

Matches a JSON string against a list of regular expression patterns.

Args:

json_string (str): The JSON string to match.

patterns (dict): A dictionary where keys are pattern names and values are regular expression strings.

Returns:

dict: A dictionary containing the matched pattern names and their corresponding matches.

Returns an empty dictionary if no patterns match.

"""

matches = {}

try:

data = json.loads(json_string) # Parse the JSON string

except json.JSONDecodeError:

return {} # Return empty dict if JSON is invalid

for pattern_name, pattern in patterns.items():

try:

match = re.search(pattern, json_string, re.DOTALL) # Search for the pattern

if match:

matches[pattern_name] = match.group(0) # Store the matched string

except re.error as e:

print(f"Invalid regex pattern '{pattern_name}': {e}") #Report invalid regex patterns

return matches

if __name__ == '__main__':

# Example usage

patterns = {

"error_message": r'"error": "(.*)"', # Matches JSON with an "error" field containing a string

"status_code": r'"status": (\d+)', # Matches JSON with a "status" field containing a number

"user_id": r'"user_id": (\d+)' #Matches JSON with a user_id field containing a number

}

# Test JSON strings

json_strings = [

'{"error": "Invalid input"}',

'{"status": 200}',

'{"user_id": 123}',

'{"message": "Success"}',

'{"status": "success"}' #This will not match status_code

]

for json_string in json_strings:

matched_patterns = match_json_pattern(json_string, patterns)

print(f"JSON: {json_string}")

print(f"Matched Patterns: {matched_patterns}")

print("-" * 20)