How do I write a simple regular expression pattern matching function in C or C++?

This is a question in my paper test today, the function signature is

int is_match(char* pattern,char* string)

The pattern is limited to only ASCII chars and the quantification * and ?, so it is relatively simple. is_match should return 1 if matched, otherwise 0.

How do I do this?

c++ c regex algorithm

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How do I write a simple regular expression pattern matching function in C or C++?

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