Finds all unique matches of a regex pattern in the given text.

This function uses a cached regex engine to improve performance by storing compiled regex patterns. If the cache exceeds 20 entries, it will be cleared to free up memory.

Arguments

• pattern - A string slice that holds the regex pattern to search for.
• text - A string slice that holds the text in which to search for the pattern.

Returns

• A PyResult containing a vector of unique matches as strings. If the pattern is invalid, returns a PyValueError with an appropriate error message.