bool regular_expression_match(char* pattern, char* string) and pattern can contain kleene star.

Question

Can you be more specific? · Accepted Answer

Do you mean pattern can only normal characters or star? Will other special characters be included, e.g. '?', '+', '{}', '[]', etc.?

Rahul · Answer

bool rep(char* pattern, char* string)
{
	if ((pattern[0] == 0) && (string[0] == 0)) return 1;
	if ((pattern[0] == 0) || (string[0] == 0)) return 0;
	if (pattern[1] == '*')
	{
		return (match(pattern, string) && (rep(pattern+2,string) || rep(pattern,string+1)));
	}
	else
	{
		return (match(pattern, string) && rep(pattern+1, string+1));
	}
}

bool match(char* pattern, char* string)
{
	if (*pattern == '.') return 1;
	return (*pattern == *string);
}

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